docs: add all current features (#34)

docs/tutorials/github.md

@@ -1 +1,72 @@
 # GitHub
+
+In this tutorial we show how to install `releaser-pleaser` in your GitHub project.
+
+## 1. Repository Settings
+
+### 1.1. Squash Merging
+
+`releaser-pleaser` requires you to use `squash` merging. With other merge options it can not reliably find the right pull request for every commit on `main`.
+
+Open your repository settings to page _General_:
+
+> `https://github.com/YOUR-NAME/YOUR-PROJECT/settings`
+
+In the "Pull Requests" section make sure that only "Allow squash merging" is enabled and "Allow merge commits" and "Allow rebase merging" is disabled.
+
+![Screenshot of the required merge settings](./github-settings-pr.png)
+
+### 1.2. Workflow Permissions
+
+`releaser-pleaser` creates [release pull requests](../explanation/release-pr.md) for you. By default, Actions are not allowed to create pull requests, so we need to enable this.
+
+Open your repository settings to page _Actions > General_:
+
+> `https://github.com/YOUR-NAME/YOUR-PROJECT/settings/actions`
+
+In the "Workflow permissions" section make sure that "Allow GitHub Actions to create and approve pull requests" is enabled.
+
+![Screenshot of the required workflow settings](./github-settings-workflow.png)
+
+## 2. GitHub Actions Workflow
+
+Create a new file `.github/workflows/releaser-pleaser.yaml` with this content. Make sure that it is available on the `main` branch.
+
+```yaml
+name: releaser-pleaser
+
+on:
+  push:
+    branches: [main]
+  pull_request_target:
+    types:
+      - edited
+      - labeled
+      - unlabeled
+
+jobs:
+  releaser-pleaser:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
+    steps:
+      - name: releaser-pleaser
+        uses: apricote/releaser-pleaser@v0.2.0
+```
+
+## 3. Release Pull Request
+
+Once this job runs for the first time, you can check the logs to see what it did.
+If you have releasable commits since the last tag, `releaser-pleaser` opens a release pull request for the proposed release.
+
+Once you merge this pull request, `releaser-pleaser` automatically creates a Git tag and GitHub Release with the proposed version and changelog.
+
+## Related Documentation
+
+- **Explanation**
+  - [Release Pull Request](../explanation/release-pr.md)
+- **Guide**
+  - [GitHub Workflow Permissions](../guides/github-workflow-permissions.md)
+- **Reference**
+  - [GitHub Action](../reference/github-action.md)