Provide Issue and PR templates

Part of #32

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Desktop (please complete the following information):**
+ - OS: [e.g. iOS]
+ - Browser [e.g. chrome, safari]
+ - Version [e.g. 22]
+
+**Smartphone (please complete the following information):**
+ - Device: [e.g. iPhone6]
+ - OS: [e.g. iOS8.1]
+ - Browser [e.g. stock browser, safari]
+ - Version [e.g. 22]
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/PULL_REQUEST_TEMPLATE/pull_request_template.md

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+# Pull Request Template
+
+## Description
+
+Please include a summary of what is fixed. For small/trivial fixes an Issue is not required, for larger items an issue is recommended to have a place to tie related changes together.
+
+Fixes # (issue)
+
+## Checklist:
+
+Please include a checklist in the description of the Pull Request of anything left to do before merging this PR.
+Delete any lines that are not relevant.
+
+- [ ] Review [contribution guidelines](https://github.com/eclipse-cdt/cdt/blob/main/CONTRIBUTING.md), particularly the [Pull Request Flow](https://github.com/eclipse-cdt/cdt/blob/main/CONTRIBUTING.md#creating-pull-requests)
+- [ ] Add an entry to [New and Noteworthy](https://github.com/eclipse-cdt/cdt/tree/main/NewAndNoteworthy) for this releases
+- [ ] Add an entry to [API Changelog](https://github.com/eclipse-cdt/cdt/blob/main/NewAndNoteworthy/CHANGELOG-API.md) for any breaking changes
+- [ ] Add an entry to [API Changelog](https://github.com/eclipse-cdt/cdt/blob/main/NewAndNoteworthy/CHANGELOG-API.md) for future planned breaking changes
+- [ ] Add an automated [JUnit Plug-in test](https://github.com/eclipse-cdt/cdt/blob/main/TESTING.md)