docs: Add using declarations to initilization readme (#374)

Add using declarations to initilization readme

Author: Mighty-Professional

docs/_docs/getting-started/library-initialization.md

@@ -5,6 +5,10 @@ permalink: /wiki/library-initialization/
 
 Initializing the MLAPI is fairly simple. You need a GameObject with the NetworkingManager component added to it. The NetworkingManager class has a static singleton reference to itself making it easy to access from anywhere. The first configuration you have to do is to set the Transport. You can read more about Transports on the [Custom Transports](/wiki/custom-transports/) page. 
 
+First add the MLAPI library to your using declarations.
+```
+using MLAPI;
+```
 
 To initialize the library. You have three options.
 
@@ -34,4 +38,4 @@ This mode runs a Server which other Clients can connect to. It has no own client
 Usage:
 ```csharp
 NetworkingManager.Singleton.StartServer();
-```
+```