App release instructions (#821)

frontend/app/RELEASING.md

@@ -0,0 +1,32 @@
+# Releasing the app
+
+These are the steps to follow when releasing a new version of the app.
+
+Make sure you are in the `frontend/app` directory, and replace `[version]` with the new version number in the following commands:
+
+```bash
+# switch to the main branch
+git switch main
+
+# pull the latest changes
+git pull origin main
+
+# make sure the app builds without errors
+pnpm build
+
+# update the app version number (no v prefix)
+pnpm version [version]
+
+# commit the version change
+git add package.json
+git commit -m "App: v[version]"
+
+# created a signed tag for the new version
+git tag -s @liquity2/app-v[version] -m '@liquity2/app-v[version]'
+
+# push the version change and the new tag
+git push origin main
+git push origin @liquity2/app-v[version]
+```
+
+Now, create a new GitHub release with the new tag (`@liquity2/app-v[version]`). The release should include a summary of the changes in the new version, following the format used in previous releases if possible.