Added Apache 2.0 License.

vm.c

@@ -1,6 +1,18 @@
-//
-// Created by Sam on 27/08/2018.
-//
+/*
+Copyright 2018 Sam Stevens
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+   http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+ */
 
 #include <stdlib.h>
 #include <string.h>