docs: Add CONTRIBUTING.md (#1009)

CONTRIBUTING.md

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+# Contributing to Hoarder
+
+First off, thank you for considering contributing to our project! This document outlines our contribution process and guidelines to make it easy for you to help improve this project.
+
+## How Can I Contribute?
+
+
+### Asking Questions
+
+If you have questions:
+
+* Use the GitHub Discussions Q&A section
+* Search existing discussions to see if your question has been answered
+* If not found, create a new discussion with a clear, descriptive title
+
+
+### Reporting Bugs
+
+If in doubt, about whether a problem you're seeing is a bug or not, use the discussions Q&A section instead. If it turns out to be a bug, we'll promote it into an issue. If you're sure it's a bug:
+* Create a new issue using the bug report template
+* Include a clear description and steps to reproduce
+* Wait for triage and labeling by maintainers
+
+
+### Suggesting Features
+
+For feature requests:
+
+* If you find a similar feature request, upvote it instead of creating a new one to help us prioritize it
+* Create a new issue using the feature request template
+* New features start with the `status/untriaged` label
+  * If the feature request is approved, the maintainers will add the `status/approved` label and assign a priority to the issue
+  * Other issues will get labeled with `status/icebox`. Issues in the icebox are not prioritized, until there's enough interest from the community
+
+
+### Working on Issues
+
+Before starting to work on an issue:
+
+* Prefer working on `status/approved` issues to make sure they get prioritized for the review
+* Comment on the issue to let others know you're working on it
+* Read the [development documentation](https://docs.hoarder.app/Development/setup) to get started
+* If you need help, you can find us in the #development channel in the [Hoarder Discord](https://discord.com/invite/NrgeYywsFh).
+* Once you're done, open a PR and wait for review. Try to include a screenshot of the change in the PR description.
+
+Please note that we're all volunteers. We'll aim to review your PR within a week from when they are opened.