add: contributing guidelines

Author: carsakiller

CONTRIBUTING.md

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+# Contributing
+Thank you for your interest in helping out, your help is greatly appreciated ❤️.
+
+Make sure you take a look at the [README](./README.md) first to get an understanding of the project.
+
+## Issues
+To report an issue, head over to the [issues page](https://github.com/carsakiller/vscode-lua-webvue/issues). First, search for any similar issues to see if someone has already solved or began talking about your issue. If not, feel free to open up a [new issue]()
+
+To help solve an issue, take a look for issues that have not already been assigned as those are the issues which are still up for grabs.
+
+## Pull Requests
+To add your own changes to this project, fork this project and check out the [development section of the README](./README.md#development). It will detail how to get set up for development and testing.
+
+Once you have your changes in your own repo, you can open a [pull request](https://github.com/carsakiller/vscode-lua-webvue/pulls) to request that your changes be added to this repository. Here are some tips for making a great pull request:
+
+- Make sure you review and test your changes first so that your pull request isn't rejected due to a small oversight or syntax error.
+- If you are solving an issue, make sure you [link your PR to it](https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue).
+- Make sure the "Allow edits by maintainers" checkbox is checked. This will allow maintainers tweak some things.