Add "contribute" file with publishing documentation (#17)

Author: pirelenito

CONTRIBUTING.md

@@ -0,0 +1,14 @@
+# Bumping versions
+
+Currently the process of updating the version of the packages is mostly manual. Before you start, first you need to make sure you have the permissions to publish the packages.
+
+- While on the `main` branch.
+- Perform a search an replace on all "package.json" files from the old version to the new. (ex `0.1.4` to `0.2.0`).
+- Run `yarn` to update the lockfile.
+- Commit the changes with a message containing the new version (ex: `0.2.0`).
+- Create an annotated git tag by running `git tag -a v0.2.0` (replace with the version). The tag message can be the version again.
+- Push commit and the tag `git push --follow-tags`.
+- Publish the packages by running `yarn publish` (it will also build the packages).
+- Then head to GitHub to draft a new release https://github.com/Mojang/ore-ui/releases/new
+- Choose the tag and click the button "Auto-generate release notes"
+- Click "publish release"