added CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing
+
+So you want to contribute to this repo? Awesome!
+
+We welcome every contribution. To do so, you have two options:
+
+1. [Create an issue](#create-an-issue) or
+2. [Open a Pull Request (PR)](#open-a-pull-request)
+
+## Create an issue
+
+There are multiple ways to create an issue. Below is how to create an issue from the repository. For more information, see "[Creating an issue](https://docs.github.com/en/issues/tracking-your-work-with-issues/creating-an-issue)."
+
+1. Go to [supabase-community/launchweek.dev](https://github.com/supabase-community/launchweek.dev)
+2. Under the repository name, click **Issues**
+3. Click **New issue**
+4. In the "Title" field, type a title for your issue, e.g. `Add {product} Launch Week`
+6. In the comment body field, type a description of your issue
+7. When you're finished, click **Submit new issue**
+
+## Open a Pull Request
+
+For more information, see "[Creating a pull request](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/creating-a-pull-request)."
+
+## Additional notes
+
+Some guidelines:
+
+- Add one launch week per PR
+  - Make sure the PR title is in the following format: `Add {product} Launch Week`
+- Add the launch week:
+```
+- YYYY / MM / DD-DD: {product} Launch Week. {links}
+```
+- Add links:
+  - Social posts:
+    `[Teaser ↗︎](https://)`
+    `[Read the thread ↗︎](https://)`
+  - Blog posts:
+    `[Read the announcement ↗︎](https://)`
+    `[Read the recap ↗︎](https://)`
+  - Launch page:
+    `[Go to launch page ↗︎](https://)` 
+- Check your spelling and grammar
+- Remove any trailing whitespace
+- Content must be in English
+
+Thank you for making this repo more awesome! Enjoy!