chore: setup issue template

Author: tmm

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug Report
+about: Create a bug report for the `react-supabase` library
+---
+
+# Bug report
+
+## Description / Observed Behavior
+
+What kind of issues did you encounter?
+
+## Expected Behavior
+
+How did you expect it to behave?
+
+## Repro Steps / Code Example
+
+Or share your code snippet or a [CodeSandbox](https://codesandbox.io) link is also appreciated!
+
+## Additional Context
+
+`react-supabase` version.
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Ask Question
+    url: https://github.com/tmm/react-supabase/discussions
+    about: Ask questions and discuss with other community members

CONTRIBUTING.md

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+# Contribution Guidelines
+
+Thank you for reading this guide and we appreciate any contribution.
+
+## Ask a Question
+
+You can use the repository's [Discussions](https://github.com/tmm/react-supabase/discussions) page to ask any questions, post feedback or share your experience on how you use this library.
+
+## Report a Bug
+
+Whenever you find something which is not working properly, please first search the repository's [Issues](https://github.com/tmm/react-supabase/issues) page and make sure it's not reported by someone else already.
+
+If not, feel free to open an issue with the detailed description of the problem and the expected behavior. And reproduction (for example a [CodeSandbox](https://codesandbox.io) link) will be extremely helpful.
+
+## Request for a New Feature
+
+For new features, it would be great to have some discussions from the community before starting working on it. You can either create an issue (if there isn't one) or post a thread in the [Discussions](https://github.com/tmm/react-supabase/discussions) page to describe the feature that you want to have.
+
+If possible, you can add other additional context like how this feature can be implemented technically, what other alternative solutions we can have, etc.