added docker-compose.yml to create the database

.gitignore

 /.idea/
 /DataBaseFolder/MySQL/mySQL-Data/
+/DataBaseFolder/MySQL/my-db/

DataBaseFolder/MySQL/docker-compose.yml

@@ -12,7 +12,7 @@ services:
       MYSQL_PASSWORD: mypassword
       MYSQL_DATABASE: switch-room-db # create this database on startup
     volumes:
-      - my-db:/var/lib/mysql
+      - ./my-db:/var/lib/mysql
     ports:
       - '3306:3306'