PR template

created a PR template

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+Thanks for creating a pull request! Please ensure visiting our [contributor's guide](https://github.com/StingraySoftware/stingray/blob/main/CONTRIBUTING.md)
+
+Please do not submit empty sections and remove them as per your requirements
+-->
+
+#### Relevant Issue(s)/PR(s)
+
+<!--
+Fixes #123. See also #789. 
+Use keywords like Fixes or Closes to link issues or pull requests, ensuring they're automatically closed upon merge. Refer [Github Documentation](https://github.com/blog/1506-closing-issues-via-pull-requests)
+-->
+
+#### Provide an overview of the implemented solution or the fix and elaborate on the modifications.
+
+<!--
+Describe your implementations.
+-->
+
+#### Is there a new dependency introduced by your contribution? If so, please specify.
+
+<!--
+Consider adding new dependencies as optional to minimize external dependencies for the core Stingray package.
+-->
+
+#### Any other comments?
+
+<!--
+Please add any other context you deem fit.
+-->
+
+
+<!--
+Thanks for contributing to Stingray!
+-->