updates readmes for mysql and postgres (#10913)

ref #10813

public/app/plugins/datasource/mysql/README.md

@@ -1,3 +1,13 @@
-# Grafana Fake Data Datasource -  Native Plugin
+# Mysql Datasource -  Native Plugin
 
-This is the built in Fake Data Datasource that is used before any datasources are set up in your Grafana installation. It means you can create a graph without any data and still get an idea of what it would look like.
+Grafana ships with a built-in MySQL data source plugin that allow you to query any visualize data from a MySQL compatible database.
+
+##Adding the data source
+1. Open the side menu by clicking the Grafana icon in the top header.
+2. In the side menu under the Dashboards link you should find a link named Data Sources.
+3. Click the + Add data source button in the top header.
+4. Select MySQL from the Type dropdown.
+
+Read more about it here:
+
+[http://docs.grafana.org/features/datasources/mysql/](http://docs.grafana.org/features/datasources/mysql/)

public/app/plugins/datasource/postgres/README.md

@@ -1,3 +1,11 @@
 # Grafana PostgreSQL Datasource -  Native Plugin
 
-This is the built in PostgreSQL Datasource that is used to connect to PostgreSQL databases.
+Grafana ships with a built-in PostgreSQL data source plugin that allows you to query and visualize data from a PostgreSQL compatible database.
+
+##Adding the data source
+1. Open the side menu by clicking the Grafana icon in the top header.
+2. In the side menu under the Dashboards link you should find a link named Data Sources.
+3. Click the + Add data source button in the top header.
+4. Select PostgreSQL from the Type dropdown.
+
+[http://docs.grafana.org/features/datasources/postgres/](http://docs.grafana.org/features/datasources/postgres/)