Updated readme and add usage

README.md

@@ -1,6 +1,14 @@
 # Starter Docker - GitHub Actions
-- Run actions with docker
+- Run actions with docker (latest version)
 - Quick and easy to use
+- Support custom registry
+- Support custom shell and commands
+
+# Usage
+```yml
+- name: Starter Docker
+  uses: CUBETIQ/starter-docker-actions@v0.1
+```
 
 # Contributors
 - Sambo Chea <sombochea@cubetiqs.com>