Create templates for issues & PRs

Should help users and contributors to report bugs,
ask for new features or submit new code.

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve the plug-in!
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+## Bug description
+
+<!-- Type a clear and concise description of what the bug is. -->
+
+## Expected behavior
+
+<!-- Type a clear and concise description of what you expected to happen. -->
+
+## How to reproduce
+
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. Witness the error
+
+## Additional context
+
+<!-- Please fill in the following fields: -->
+
+- **Plug-in version**:
+- **Eclipse IDE version**:

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: feature request
+assignees: ''
+
+---
+
+## Motivation
+
+<!-- Type a clear and concise description of what the problem is. Ex. I'm always frustrated when [...] -->
+
+## Proposed Solution
+
+<!-- Type a clear and concise description of what you would like to happen. -->

.github/PULL_REQUEST_TEMPLATE/bug_fix.md

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+<!-- Template hugely inspired from: https://github.com/appium/appium/blob/355980b6b2dc8cfc5b19cb3420ab6c5f56884a1e/.github/PULL_REQUEST_TEMPLATE.md -->
+
+## Bug description
+
+<!-- Describe the bug fixed by this PR. If there is already a related issue be sure to link it. -->
+
+## Solution
+
+<!-- Describe the big picture of your changes here to communicate to the maintainers why we should accept this pull request. -->
+
+## Checklist
+
+_Put an `x` in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your code._
+
+- [ ] I have read the [CONTRIBUTING](https://github.com/echebbi/eclipse-discord-integration/blob/master/CONTRIBUTING.md) doc
+- [ ] The Maven build pass locally with my changes
+- [ ] I have added tests that prove my feature works
+- [ ] I have added necessary documentation (if appropriate)
+
+## Further comments
+
+<!-- If this is a relatively large or complex change, kick off the discussion by explaining why you chose the solution you did and what alternatives you considered, etc... -->

.github/PULL_REQUEST_TEMPLATE/new_feature.md

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+<!-- Template hugely inspired from: https://github.com/appium/appium/blob/355980b6b2dc8cfc5b19cb3420ab6c5f56884a1e/.github/PULL_REQUEST_TEMPLATE.md -->
+
+## Proposed changes
+
+<!-- Describe the big picture of your changes here to communicate to the maintainers why we should accept this pull request. If it resolves a feature request, be sure to link to that issue. -->
+
+## Checklist
+
+_Put an `x` in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your code._
+
+- [ ] I have read the [CONTRIBUTING](https://github.com/echebbi/eclipse-discord-integration/blob/master/CONTRIBUTING.md) doc
+- [ ] The Maven build pass locally with my changes
+- [ ] I have added tests that prove my feature works
+- [ ] I have added necessary documentation (if appropriate)
+
+## Further comments
+
+<!-- If this is a relatively large or complex change, kick off the discussion by explaining why you chose the solution you did and what alternatives you considered, etc... -->