docs: update readme (#1)

plugins/fastlane-plugin-android_cd/README.md

@@ -62,6 +62,20 @@ gpg --quiet --batch --yes --symmetric --passphrase="<android-key-passphrase>" --
 
 Once your folder is compressed, encrypted, and placed in the android folder of your project, you can call the actions of this plugin in your various lanes.
 
+#### Build and Deploy
+
+```ruby
+build_and_deploy(beta_type: "internal")
+```
+
+#### Promote
+
+```ruby
+promote(beta_type: "internal")
+```
+
+note that beta type can be `production`, `beta`, `alpha`, `internal`.
+
 ## Run tests for this plugin
 
 To run both the tests, and code style validation, run