Update document

README.md

@@ -6,12 +6,17 @@ This [GitHub Action](https://github.com/features/actions) sets up a MySQL databa
 
 ```yaml
 steps:
-- uses: mirromutth/mysql-action@v1
+- uses: mirromutth/mysql-action@v1.1
   with:
-    mysql password: ${{ secrets.databasePassword }} # Required, the password of the superuser for the specified database
-    mysql user: 'developer' # Optional, default value is "test", the superuser for the specified database. Of course you can use secrets, too
-    mysql version: '8.0' # Optional, default value is "latest", the version of the MySQL in Docker
-    mysql database: 'some_test' # Optional, default value is "test", the specified database which will be create
+    host port: 3800 # Optional, default value is 3306. The port of host
+    container port: 3307 # Optional, default value is 3306. The port of container
+    character set server: 'utf8' # Optional, default value is 'utf8mb4'. The '--character-set-server' option for mysqld
+    collation server: 'utf8_general_ci' # Optional, default value is 'utf8mb4_general_ci'. The '--collation-server' option for mysqld
+    mysql version: '8.0' # Optional, default value is "latest". The version of the MySQL
+    mysql database: 'some_test' # Optional, default value is "test". The specified database which will be create
+    mysql root password: ${{ secrets.RootPassword }} # Required if "mysql user" is empty, default is empty. The root superuser password
+    mysql user: 'developer' # Required if "mysql root password" is empty, default is empty. The superuser for the specified database. Of course you can use secrets, too
+    mysql password: ${{ secrets.DatabasePassword }} # Required if "mysql user" exists. The password for the "mysql user"
 ```
 
 See [Docker Hub](https://hub.docker.com/_/mysql) for available versions.