[skip ci] Add issue and pull request template for better communication

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+Thanks for your interest in the project. I appreciate bugs filed and PRs submitted!
+Please make sure that you are familiar with and follow the Code of Conduct for
+this project (found in the CODE_OF_CONDUCT.md file).
+Also, please make sure you're familiar with and follow the instructions in the
+contributing guidelines (found in the CONTRIBUTING.md file).
+If you're new to contributing to open source projects, you might find this free
+video course helpful: http://kcd.im/pull-request
+Please fill out the information below to expedite the review and (hopefully)
+merge of your pull request!
+-->
+
+<!-- What changes are being made? (What feature/bug is being fixed here?) -->
+
+**What**:
+
+<!-- Why are these changes necessary? -->
+
+**Why**:
+
+<!-- How were these changes implemented? -->
+
+**How**:
+
+<!-- Have you done all of these things?  -->
+
+**Checklist**:
+
+<!-- add "N/A" to the end of each line that's irrelevant to your changes -->
+<!-- to check an item, place an "x" in the box like so: "- [x] Documentation" -->
+
+- [ ] Documentation
+- [ ] Added/updated unit tests
+- [ ] Code complete
+
+<!-- feel free to add additional comments -->

.github/workflows/bug.md

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+---
+name: "\U0001F41E Bug report"
+about: Something isn’t working as expected
+title: ''
+labels: 'bug'
+assignees: ''
+---
+
+**To reproduce:**
+
+```less
+// less code here
+```
+
+**Current behavior:**
+
+<!-- A clear and concise description of what the bug is -->
+
+**Expected behavior:**
+
+<!-- A clear and concise description of what you expected to happen -->
+
+**Environment information:**
+
+<!-- Provide the `less` and `nodejs` packages versions -->
+
+- `less` version:
+- `nodejs` version:
+- `operating system`:
+<!-- macos, linux or windows ? -->
+
+<!-- feel free to add additional comments -->

.github/workflows/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: ✨ Feature Request / idea
+    url: https://github.com/less/less.js/discussions/new
+    about: Missing something in Less? Let us know.
+  - name: 💬 Question / Discussion
+    url: https://github.com/less/less.js/discussions/new
+    about: Feel free to ask anything
+  - name: 📖 View documentation
+    url: https://lesscss.org
+    about: Official Less documentation    
+  - name: ❓ StackOverflow
+    url: https://stackoverflow.com/questions/tagged/less
+    about: Ask question or find answers on Stack overflow