Add "getting started" documentation (#103)

Author: austindrenski

doc/index.md

@@ -6,6 +6,30 @@ title: Entity Framework 6
 Npgsql has an Entity Framework 6 provider. You can use it by installing the
 [EntityFramework6.Npgsql](https://www.nuget.org/packages/EntityFramework6.Npgsql/) nuget.
 
+## Basic Configuration ##
+To use Entity Framework with Npgsql, define a class that inherits from `DbConfiguration` in the same assembly as your class inheriting `DbContext`. Ensure that you configure provider services, a provider factory, a default connection factory as shown below:
+
+```csharp
+using Npgsql;
+using System.Data.Entity;
+
+class NpgSqlConfiguration : DbConfiguration
+{
+    public NpgSqlConfiguration()
+    {
+        var name = "Npgsql";
+            
+        SetProviderFactory(providerInvariantName: name, 
+        providerFactory: NpgsqlFactory.Instance);
+
+        SetProviderServices(providerInvariantName: name, 
+        provider: NpgsqlServices.Instance);
+
+        SetDefaultConnectionFactory(connectionFactory: new NpgsqlConnectionFactory());
+    }
+}
+```
+
 ## Guid Support ##
 
 Npgsql EF migrations support uses `uuid_generate_v4()` function to generate guids.