Update README.md

Author: shmokmt

README.md

@@ -1 +1,30 @@
 # actions-setup-tfcmt
+
+[![Setup test](https://github.com/shmokmt/actions-setup-tfcmt/actions/workflows/test.yml/badge.svg)](https://github.com/shmokmt/actions-setup-tfcmt/actions/workflows/test.yml)
+
+The shmokmt/actions-setup-tfcmt action installs [suzuki-shunsuke/tfcmt](https://github.com/suzuki-shunsuke/tfcmt) to the `PATH` in your GitHub Actions.
+
+## `Inputs`
+
+version
+Optional The version of tfcmt. Default "latest".
+
+## Usage
+
+This action can run be on `ubuntu-latest` and `macos-latest`.
+
+Use latest version
+
+```
+steps:
+- uses: shmokmt/setup-tfcmt@v1
+```
+
+Use specific version
+
+```
+steps:
+- uses: shmokmt/setup-tfcmt@v1
+  with:
+    terraform_version: v2.1.0
+```