chore: initial-commit (#1)

Reviewed-on: #1
Co-authored-by: Timo Behrendt <t.behrendt@t00n.de>
Co-committed-by: Timo Behrendt <t.behrendt@t00n.de>

README.md

@@ -1,2 +1,62 @@
-# conventional-semantic-git-tag-increment
+# Conventional Semantic Git Tag Increment
 
+A GitHub Action that automatically increments semantic version tags based on conventional commit messages.
+
+Doesn't assume that you are using any special packaging software, etc. It just relies on Git having tags and commit messages.
+
+## Usage
+
+### Basic workflow
+
+```yaml
+name: Auto-tag
+
+on:
+  push:
+    branches: [main]
+
+jobs:
+  tag:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - uses: tbehrendt/conventional-semantic-git-tag-increment@v1
+        id: tag
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Create and push tag
+        run: |
+          git tag ${{ steps.tag.outputs.new-tag }}
+          git push origin ${{ steps.tag.outputs.new-tag }}
+```
+
+### With custom last tag
+
+```yaml
+- uses: tbehrendt/conventional-semantic-git-tag-increment@v1
+  with:
+    last-tag: "v2.1.0"
+    token: ${{ secrets.GITHUB_TOKEN }}
+```
+
+## Examples
+
+| Commit Message                      | Current Tag | New Tag  | Reason               |
+| ----------------------------------- | ----------- | -------- | -------------------- |
+| `feat: add user authentication`     | `v1.0.0`    | `v1.1.0` | New feature          |
+| `fix: resolve login bug`            | `v1.1.0`    | `v1.1.1` | Bug fix              |
+| `feat!: change API response format` | `v1.1.1`    | `v2.0.0` | Breaking change      |
+| `docs: update README`               | `v2.0.0`    | `v2.0.1` | Documentation update |
+
+## Inputs
+
+- `last-tag` (optional): Starting tag to increment from. If not provided, uses the latest tag in the repository.
+- `token` (required): GitHub token for repository access. Use `${{ github.token }}` for public repos or a PAT for private repos.
+
+## Outputs
+
+- `new-tag`: The incremented semantic version tag (e.g., `1.2.3`)