Included Percona in the docs

Author: naillizard

DOCUMENTATION/content/introduction/index.md

@@ -83,7 +83,7 @@ In adhering to the separation of concerns principle as promoted by Docker, Larad
 You can turn On/Off as many instances of as any container without worrying about the configurations, everything works like a charm.
 
 - **Database Engines:**
-MySQL - MariaDB - MongoDB - Neo4j - RethinkDB - MSSQL - PostgreSQL - Postgres Postgis.
+MySQL - MariaDB - Percona - MongoDB - Neo4j - RethinkDB - MSSQL - PostgreSQL - Postgres Postgis.
 - **Cache Engines:**
 Redis - Memcached - Aerospike
 - **PHP Servers:**