Update 'README.md'

README.md

@@ -16,3 +16,14 @@ mysqldump -v -h $DB_HOST --user=$DB_USER -p"$DB_PASSWORD" $DB_NAME > $TARGET_FIL
 mysql -uroot -p database_name < file.sql
 ```
 
+## Misc
+```bash
+# list users
+SELECT user, host FROM mysql.user;
+
+# grant all permisions
+GRANT ALL PRIVILEGES ON mydb.* TO 'myuser'@'%' WITH GRANT OPTION;
+
+```
+
+