chore: added pull request template to enable contributions

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+Thank you very much for your contribution!
+We really appreciate your effort to improve this library for everyone.
+Please fill out the rest of the information here.
+It will help us to review, validate, and merge your changes 😃
+-->
+
+## ✅ Checklist
+
+<!--
+Please check the applicable items below. Please write any extra relevant context after an item.
+-->
+
+- [ ] I have
+  followed [this library's contributing guidance](https://github.com/hossein-zare/react-native-dropdown-picker/blob/dev-5.x/CONTRIBUTING.md).
+- [ ] I have
+  read [this library's docs](https://hossein-zare.github.io/react-native-dropdown-picker-website/docs),
+  and it still makes sense to make these changes.
+- [ ] I have
+  read [this library's GitHub issues](https://github.com/hossein-zare/react-native-dropdown-picker/issues),
+  and it still makes sense to make these changes.
+- [ ] I
+  have [made an issue](https://github.com/hossein-zare/react-native-dropdown-picker/issues)
+  for the new feature/bug fix/etc this PR implements (or one already existed).
+- [ ] I
+  have [tested my changes and this library as a whole with npm pack](https://dev.to/scooperdev/use-npm-pack-to-test-your-packages-locally-486e),
+  and everything works.
+- [ ] My changes pass all the
+  repo's [CI/status checks](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/collaborating-on-repositories-with-code-quality-features/about-status-checks),
+  including the Prettier and ESLint checks.
+- [ ] I
+  have [squashed all my changes into one commit](https://www.geeksforgeeks.org/git-squash/).
+- [ ] My single commit message conforms
+  to [the Conventional Commits specification](https://www.conventionalcommits.org/en/v1.0.0/#summary).
+- [ ] I
+  have [kept my changes up-to-date with those in the
+  `dev-5.x` (default)branch](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/keeping-your-pull-request-in-sync-with-the-base-branch).
+- [ ] I understand that each atomic change (e.g. fixing one bug or adding one
+  feature) [should be submitted in its own PR](https://learning-notes.mistermicheels.com/processes-techniques/small-commits-pull-requests/).
+  Therefore, this PR contains only one such atomic change, and I will submit any
+  different changes in their own, separate PRs.
+
+## 👀 Relevant issue(s)
+
+<!--
+Fill out the issue/s your PR pertains to below. Delete as appropriate.
+For example, "Fixes bug #111" or "Implements feature request #222".
+-->
+
+- Fixes bug #<Bug_GitHub_issue_number_goes_here>
+- Implements feature request #<Feature_req_GitHub_issue_number_goes_here>
+
+## 🚀️ Changes made
+
+### What
+
+<!--
+Please give a brief overview of the changes this PR makes.
+What does it change for users of the library?
+-->
+
+### Why
+
+<!--
+Please describe the motivation for this PR. Why are its changes needed?
+-->
+
+### How
+
+<!--
+How did you create the changes in this PR?
+How did you implement them?
+Why did you choose to implement them in the way you did?
+-->
+
+### Tests
+
+<!--
+Please describe how you tested these changes and this library as a whole after making them.
+Please describe how a reviewer could reproduce your tests.
+If possible, please also provide terminal output and/or screenshots demonstrating your tests and/or feature working correctly.
+Please describe the outcome of your tests. Does everything work? Do you need help fixing an issue?
+-->
+
+## 📄 Documentation
+
+### Relevant docs pages
+
+<!--
+Please include links to any pages in this library's docs that are relevant.
+The docs can be found at: https://hossein-zare.github.io/react-native-dropdown-picker-website/docs
+If none, type "N/A" and describe whether information should be added to the docs and why.
+Then, open an issue in the docs repo to add more information needed to the docs.
+-->
+
+### JSDoc
+
+- [ ] I updated all the JSDoc comments which were made incorrect by the
+  changes in this PR.
+- [ ] I added JSDoc comments to all the classes, functions, files, etc that I
+  changed in this PR that did not already have JSDoc comments.
+
+### Changes
+
+<!--
+Please describe whether the changes made in this PR necessitate changing this 
+library's docs. They might need to be updated and/or completed to add any 
+information you feel is missing or will become incorrect with the changes 
+made in this PR. If changes to the docs are required, please describe them here
+and then also in a new issue to make them in the docs repo for this library: 
+https://github.com/hossein-zare/react-native-dropdown-picker-website
+-->
+
+## 🏁 Final details
+
+### Help required
+
+<!--
+Please include any help you need. We'll be happy to provide it 😃
+Maybe you need help to understand how certain parts of this library work?
+Maybe you need help to fix a particular issue you're struggling to solve alone?
+If you don't need any, say "N/A".
+-->
+
+### Additional context/info
+
+<!--
+Please include any other information you think is relevant to this PR.
+-->