Merge branch 'staging' into 'main'

added README.md to staging

See merge request !37

README.MD

+# Steps for running the container
+1. Create a '.env' file in the root directory of the repository (/topgym) <br />
+2. In the .env file add the following two variables:
+    1. MYSQL_DATABASE='topgym' <br />
+    2. MYSQL_ROOT_PASSWORD='test123' <br />
+
+3. Finally, in the console run the following command: <br />
+**docker_compose up**
+