Updated documenation

docs/documentation/android/appSetup.md

@@ -23,9 +23,13 @@ public class MainActivity extends AppCompatActivity {
     }
 }
 ```
+With setContentView you can set the layout file that you made earlier.
+``` java
+        setContentView(R.layout.activity_main);
+```
 
 ### Manifest
-For the app to be able to build you need to add the activity to the manifest file. You can do this by adding this to the manifest file.
+For the app to be able to build you need to add the activity class to the manifest file.
 
 ```xml
         <activity android:name=".MainActivity"
@@ -36,4 +40,4 @@ For the app to be able to build you need to add the activity to the manifest fil
             </intent-filter>
         </activity>
 ```
-The class name that is ran first is defined in the first line of the class.
+In this instance MainActivity is the first class that is ran.