Add README

Author: EndBug

README.md

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+# Add & Commit
+
+You can use this GitHub Action to commit changes made in your workflow run directly to your repo: for example, you use it to lint your code, update documentation, commit updated builds and so on...
+
+This is **heavily** inspired by [git-auto-commit-action](https://github.com/stefanzweifel/git-auto-commit-action) (by [Stefan Zweifel](https://github.com/stefanzweifel)): that action automatically detects changed files and commits them. While this is useful for most situations, this doesn't commit untracked files and can sometimes commit unintended changes (such as `package-lock.json` or similar, that may have happened during previous steps).  
+This action lets you choose the path that you want to use when adding & committing changes, so that it works as you would normally do using `git` on your machine.
+
+## Usage
+
+Add a step like this to your workflow:
+
+```yaml
+- name: Commit changes # This is the step name that will be displayed in your runs
+  uses: EndBug/[email protected] # You can change this to use a specific version
+  with: # See more info about inputs below
+    author_name: Your Name
+    author_email: [email protected]
+    message: "Your commit message"
+    path: ./*.js
+  env:
+    GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} # Leave this line unchanged
+```
+
+### Inputs:
+
+- `author_name` : the name of the user that will be displayed as the author of the commit
+- `author_email` : the email of the user that will be displayed as the author of the commit
+- `message` : the message for the commit
+- `path` : the path to stage files from
+
+### Environment variables:
+
+The only `env` variable required is the token for the action to run: GitHub generates one automatically, but you need to pass it through `env` to make it available to actions. You can find more about `GITHUB_TOKEN` [here](https://help.github.com/en/articles/virtual-environments-for-github-actions#github_token-secret).  
+With that said, you can just copy the example line and don't worry about it. If you do want to use a different token you can pass that in, but I wouldn't see any possible advantage in doing so.
+
+### Example:
+
+You want to lint your JavaScript files, located in the `src` folder, with ESLint so that fixable changes are done without your intervention. You can use a workflow like this:
+
+```yaml
+name: Lint source code
+on: push
+
+jobs: 
+  run:
+    name: Lint with ESLint
+    runs-on: ubuntu-latest
+    steps: 
+    - name: Checkout repo
+      uses: actions/checkout@master
+
+    - name: Set up Node.js
+      uses: actions/setup-node@master
+      with:
+        node-version: 10.0.0
+    
+    - name: Install dependencies
+      run: npm install
+
+    - name: Update source code
+      run: eslint "src/**" --fix
+
+    - name: Commit changes
+      uses: EndBug/[email protected] 
+      with:
+        author_name: Your Name
+        author_email: [email protected]
+        message: "Your commit message"
+        path: ./*.js
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+```
+
+## License
+
+This action is distributed under the MIT license, check the [license](LICENSE) for more info.