chore(project): add action files

README.md

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+# git-cliff changelog generator action
+
+This action generates a changelog based on your Git history using [git-cliff](https://github.com/orhun/git-cliff), on the fly!
+
+## Usage
+
+### Inputs
+
+* `args`: Arguments to pass to git-cliff. Default `"-v"`
+
+### Outputs
+
+* `changelog`: The generated changelog.
+
+### Examples
+
+```
+- name: Changelog Generator
+  uses: orhun/git-cliff-action@v1
+  with:
+    args: --verbose
+```
+
+## Credits
+
+This action is based on [lycheeverse/lychee-action](https://github.com/lycheeverse/lychee-action) and uses [git-cliff](https://github.com/orhun/git-cliff).
+
+## License
+
+GNU General Public License ([v3.0](https://www.gnu.org/licenses/gpl.txt))
+
+## Copyright
+
+Copyright © 2021, [Orhun Parmaksız](mailto:orhunparmaksiz@gmail.com)