Added Pull Request Template

.github/PULL_REQUEST_TEMPLATE.MD

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+<!-- Delete Template sections if unneccesary -->
+<!-- Add issue number here (We encourage you to create the Issue First) -->
+<!-- You can also link the issue in Commit Messages -->
+
+<!--
+Make sure these boxes are checked before your pull request (PR) is ready to be reviewed and merged. Thanks!
+* [x] - Checked Box
+* [ ] - Unchecked Box
+-->
+
+## What's this PR about?
+
+<!-- Tell us what you've changed and why. -->
+
+Fixes #0000
+
+## What kind of change is this?
+
+<!-- Check the boxes that apply to your PR -->
+* [ ] Bug fix 
+* [ ] New feature
+* [ ] Documentation update
+* [ ] New importer pipeline ([How to add](https://vulnerablecode.readthedocs.io/en/latest/tutorial_add_importer_pipeline.html))
+* [ ] New improver pipeline ([How to add](https://vulnerablecode.readthedocs.io/en/latest/tutorial_add_improver_pipeline.html))
+* [ ] Code cleanup or performance improvement
+* [ ] Other: _____
+
+## Checklist before requesting a review
+
+* [ ] read the [contribution guidelines](https://vulnerablecode.readthedocs.io/en/latest/contributing.html)
+* [ ] code follows the project style
+* [ ] titled PR clearly and linked the issue it resolves
+* [ ] added tests for changes
+* [ ] updated docs if needed
+* [ ] updated the [CHANGELOG](https://github.com/aboutcode-org/vulnerablecode/blob/main/CHANGELOG.rst) if needed
+* [ ] code passes all tests locally
+* [ ] commits follow the [project's commit message style](https://aboutcode.readthedocs.io/en/latest/contributing/writing_good_commit_messages.html)
+
+## AI assistance?
+
+* [ ] used AI tools (like ChatGPT, Copilot, etc.) to help with this PR
+  * If yes, please share which parts: <!-- "Some code in file X," "documentation," etc. -->
+
+## Anything else we should know?
+
+<!-- Any extra context or screenshots that might help with the review -->
+
+<!--
+We're happy to help you get this ready -- don't be afraid to ask for help, and **don't be discouraged**
+if your tests fail at first!
+If tests do fail, click on the red `X` to learn why by reading the logs.
+Thanks!
+-->
+
+<!-- Don't forget your sign-off! -->
+Signed-off-by: YOUR NAME <YOUR_EMAIL>