Added command for docker data persistence to main README

README.md

@@ -68,7 +68,10 @@ Turns any MySQL, PostgreSQL, SQL Server, SQLite & MariaDB into a smart-spreadshe
 docker run -d --name nocodb -p 8080:8080 nocodb/nocodb:latest
 ```
 
-> To persist data you can mount volume at `/usr/app/data/`.
+> To persist data you can mount volume at `/usr/app/data/`. For example:
+```bash
+docker run -d -p 8080:8080 --name nocodb -v /local/path:/usr/app/data/ nocodb/nocodb:latest
+```
 
 ### Using Npm
 ```