[ADD] comment

app/src/main/java/com/a1/nextlocation/MainActivity.java

@@ -6,6 +6,10 @@ import android.os.Bundle;
 
 public class MainActivity extends AppCompatActivity {
 
+    /**
+     * onCreate method that creates the main activity
+     * @param savedInstanceState the saved instance state of the app
+     */
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);