Add: GitHub materials, resources section, and repo README updates

.github/.gitmessage

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+# <type>: <short summary> (max 50 chars)
+#
+# Types:
+#   Add       — New content, files, examples
+#   Fix       — Bug fix or correction
+#   Refactor  — Code restructure (no new functionality)
+#   Document  — README, comments, guides
+#   Update    — Modify existing content
+#   Remove    — Delete files or code
+#   Style     — Formatting, whitespace, naming
+#
+# Body (optional): explain WHY, not WHAT (wrap at 72 chars)
+#
+# Footer (optional): reference issues — e.g. Closes #12
+

.github/ISSUE_TEMPLATE/bug-report.yml

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+name: Bug Report
+description: Report code that doesn't compile or behaves incorrectly.
+title: "[Bug] "
+labels: ["bug"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for reporting! Please fill out the sections below.
+
+  - type: input
+    id: file
+    attributes:
+      label: File / Example
+      description: Which file or example is affected?
+      placeholder: e.g. fundamentals/functions/methodes.h
+    validations:
+      required: true
+
+  - type: textarea
+    id: description
+    attributes:
+      label: What happened?
+      description: Describe the bug — expected vs. actual behavior.
+    validations:
+      required: true
+
+  - type: textarea
+    id: reproduction
+    attributes:
+      label: Steps to reproduce
+      description: How can the bug be triggered?
+      value: |
+        1. Compile with `g++ ...`
+        2. Run `./program`
+        3. See error ...
+    validations:
+      required: false
+
+  - type: dropdown
+    id: compiler
+    attributes:
+      label: Compiler
+      options:
+        - g++ (MinGW / Linux)
+        - MSVC (Visual Studio)
+        - clang++
+        - Other
+    validations:
+      required: false
+
+  - type: textarea
+    id: logs
+    attributes:
+      label: Error output / logs
+      description: Paste any compiler errors or runtime output.
+      render: shell
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Roadmap
+    url: https://github.com/PtiCalin/cpp/blob/main/ROADMAP.md
+    about: Check the learning roadmap before opening an issue.

.github/ISSUE_TEMPLATE/new-content.yml

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+name: New Content
+description: Suggest a new example, topic, or project to add.
+title: "[Content] "
+labels: ["enhancement", "content"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Suggest something to add to the learning repository.
+
+  - type: dropdown
+    id: phase
+    attributes:
+      label: Roadmap Phase
+      description: Which phase does this relate to?
+      options:
+        - "Phase 1 — Foundations"
+        - "Phase 2 — Modular Programming"
+        - "Phase 3 — OOP"
+        - "Phase 4 — File I/O"
+        - "Phase 5 — Console Projects"
+        - "Phase 6 — Next Steps"
+        - "Not sure"
+    validations:
+      required: true
+
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: What should be added and why?
+    validations:
+      required: true
+
+  - type: textarea
+    id: references
+    attributes:
+      label: References / Resources
+      description: Any links, articles, or examples that could help?
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/question.yml

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+name: Question / Learning Note
+description: Ask a question or log something you want to revisit.
+title: "[Question] "
+labels: ["question"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Use this to log a C++ question or concept you want to explore further.
+
+  - type: input
+    id: topic
+    attributes:
+      label: Topic
+      placeholder: e.g. virtual destructors, template specialization
+    validations:
+      required: true
+
+  - type: textarea
+    id: question
+    attributes:
+      label: Question / Note
+      description: What are you trying to understand?
+    validations:
+      required: true
+
+  - type: textarea
+    id: context
+    attributes:
+      label: Context
+      description: Any code, links, or details that provide context.
+    validations:
+      required: false

.github/labels.yml

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+# Repository labels — synced by .github/workflows/label-sync.yml
+
+# Type
+- name: bug
+  color: "d73a4a"
+  description: Something isn't working.
+
+- name: enhancement
+  color: "a2eeef"
+  description: New feature or improvement.
+
+- name: content
+  color: "0075ca"
+  description: New example, topic, or project.
+
+- name: question
+  color: "d876e3"
+  description: Question or concept to revisit.
+
+- name: documentation
+  color: "0e8a16"
+  description: README, guide, or comment update.
+
+# Status
+- name: stale
+  color: "ededed"
+  description: Inactive — will be closed soon.
+
+- name: pinned
+  color: "006b75"
+  description: Exempt from stale bot.
+
+- name: good first issue
+  color: "7057ff"
+  description: Good for newcomers.
+
+# Phase (maps to ROADMAP)
+- name: "phase:1-foundations"
+  color: "fbca04"
+  description: "Phase 1 — Foundations"
+
+- name: "phase:2-modular"
+  color: "fbca04"
+  description: "Phase 2 — Modular Programming"
+
+- name: "phase:3-oop"
+  color: "fbca04"
+  description: "Phase 3 — OOP"
+
+- name: "phase:4-file-io"
+  color: "fbca04"
+  description: "Phase 4 — File I/O"
+
+- name: "phase:5-projects"
+  color: "fbca04"
+  description: "Phase 5 — Console Projects"
+
+- name: "phase:6-next"
+  color: "fbca04"
+  description: "Phase 6 — Next Steps"

.github/release-drafter.yml

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+# Release Drafter config — categorises merged PRs into release notes.
+
+name-template: "v$RESOLVED_VERSION"
+tag-template: "v$RESOLVED_VERSION"
+
+categories:
+  - title: "New Content"
+    labels:
+      - content
+      - enhancement
+  - title: "Bug Fixes"
+    labels:
+      - bug
+  - title: "Documentation"
+    labels:
+      - documentation
+  - title: "Maintenance"
+    labels:
+      - stale
+
+change-template: "- $TITLE (#$NUMBER) @$AUTHOR"
+no-changes-template: "No changes since the last release."
+
+version-resolver:
+  major:
+    labels: []
+  minor:
+    labels:
+      - enhancement
+      - content
+  patch:
+    labels:
+      - bug
+      - documentation
+  default: patch
+
+template: |
+  ## What's Changed
+
+  $CHANGES
+
+  **Full Changelog**: https://github.com/$OWNER/$REPOSITORY/compare/$PREVIOUS_TAG...v$RESOLVED_VERSION

.github/workflows/ci.yml

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+# CI — Compile check for C++ files
+# Runs on every push and PR to main.
+
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Install g++
+        run: sudo apt-get update && sudo apt-get install -y g++
+
+      - name: Compile standalone examples
+        run: |
+          echo "=== Compiling standalone .cpp files ==="
+          exit_code=0
+          for file in $(find . -name '*.cpp' -not -path './.github/*'); do
+            echo "--- $file ---"
+            g++ -std=c++17 -Wall -Wextra -fsyntax-only "$file" 2>&1 || exit_code=1
+          done
+          exit $exit_code

.github/workflows/label-sync.yml

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+# Label Sync — keep labels consistent via config file.
+# Run manually or on push to .github/labels.yml.
+
+name: Sync Labels
+
+on:
+  push:
+    branches: [main]
+    paths: [.github/labels.yml]
+  workflow_dispatch:
+
+jobs:
+  sync:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Sync labels
+        uses: EndBug/label-sync@v2
+        with:
+          config-file: .github/labels.yml
+          delete-other-labels: false
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/release-drafter.yml

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+# Release Drafter — auto-generates draft release notes from merged PRs.
+
+name: Release Drafter
+
+on:
+  push:
+    branches: [main]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pull-requests: read
+
+jobs:
+  draft:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: read
+    steps:
+      - uses: release-drafter/release-drafter@v6
+        with:
+          config-name: release-drafter.yml
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/stale.yml

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+# Stale — close inactive issues and PRs after a grace period.
+
+name: Stale
+
+on:
+  schedule:
+    - cron: "0 8 * * 1" # every Monday at 08:00 UTC
+
+permissions:
+  issues: write
+  pull-requests: write
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/stale@v9
+        with:
+          stale-issue-message: >
+            This issue has been inactive for 30 days and will be closed in 7 days
+            unless there is new activity.
+          stale-pr-message: >
+            This PR has been inactive for 30 days and will be closed in 7 days
+            unless there is new activity.
+          days-before-stale: 30
+          days-before-close: 7
+          stale-issue-label: stale
+          stale-pr-label: stale
+          exempt-issue-labels: pinned