Add issue templates

.github/ISSUE_TEMPLATE/blank_issue.md

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+---
+name: Blank Issue
+about: Create a blank issue.
+---

.github/ISSUE_TEMPLATE/bug_macos.yml

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+name: MacOS bug
+description: Create a macOS-specific bug report
+labels:
+  - B - bug
+  - DS - macos
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this bug report!
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: Description of the problem you're having
+    validations:
+      required: true
+  - type: textarea
+    id: os-version
+    attributes:
+      label: macOS version
+      description: What version of macOS are you using? Please paste in the output of `sw_vers`.
+      placeholder: |
+        ProductName:            macOS
+        ProductVersion:         14.2.1
+        BuildVersion:           23C71
+      render: shell
+    validations:
+      required: true
+  - type: textarea
+    id: winit-version
+    attributes:
+      label: Winit version
+      description: What version of Winit are you using?
+      placeholder: 0.29.10
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/bug_wayland.yml

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+name: Wayland bug
+description: Create a Wayland-specific bug report
+labels:
+  - B - bug
+  - DS - wayland
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this bug report!
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: Description of the problem you're having
+    validations:
+      required: true
+  - type: checkboxes
+    attributes:
+      label: Window isn't shown unless you draw
+      options:
+        - label: I understand that windows aren't shown on Wayland unless you draw to them.
+          required: true
+  - type: textarea
+    id: winit-version
+    attributes:
+      label: Winit version
+      description: What version of Winit are you using?
+      placeholder: 0.29.10
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/bug_web.yml

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+name: Web bug
+description: Create a web-specific bug report
+labels:
+  - B - bug
+  - DS - web
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this bug report!
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: Description of the problem you're having
+    validations:
+      required: true
+  - type: checkboxes
+    id: browsers
+    attributes:
+      label: Browsers
+      description: What browsers are you seeing the problem on?
+      options:
+        - label: Firefox
+        - label: Chrome
+        - label: Safari
+        - label: Microsoft Edge
+    validations:
+      required: true
+  - type: textarea
+    id: winit-version
+    attributes:
+      label: Winit version
+      description: What version of Winit are you using?
+      placeholder: 0.29.10
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Question
+    url: https://matrix.to/#/#rust-windowing:matrix.org
+    about: Please ask questions on the Matrix channel.

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature request
+description: Propose a new feature
+labels:
+  - S - enhancement
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: Description of the problem does this solve or what need does it fill? Please be mindful of the [scope](FEATURES.md) of Winit.
+    validations:
+      required: true
+  - type: dropdown
+    id: platforms
+    attributes:
+      label: Relevant platforms
+      description: On which platforms is this feature relevant?
+      options:
+        - Windows
+        - macOS
+        - Wayland
+        - X11
+        - Web
+        - iOS
+        - Android
+      multiple: true