Add README and LICENSE files

README.md

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+# `setup-just` action
+
+![build](https://img.shields.io/github/workflow/status/extractions/setup-just/build)
+
+This GitHub Action will install the latest release of the
+[just](https://github.com/casey/just) command runner for you.
+
+## Usage
+
+### Inputs
+
+| Name      | Required | Description                                             | Type   | Default |
+| --------- | -------- | ------------------------------------------------------- | ------ | ------- |
+| `version` | no       | A valid semver specification for the version to install. | string | *       |
+
+
+### Basic example
+
+Add the following to your workflow.
+
+```yaml
+- uses: extractions/setup-just@v1
+  with:
+    version: 0.5
+  env:
+    # this is not required but will be prevent any rate limiting issues
+    GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+```
+
+## License
+
+Licensed under either of
+
+- Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or
+   http://www.apache.org/licenses/LICENSE-2.0)
+- MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
+
+at your option.