Added notice for the third-party OSS code

NOTICE

@@ -0,0 +1,8 @@
+Context.h
+Copyright (c) 2016 Intel Corporation.
+
+This product includes software developed by Intel Corporation.
+
+This product includes code derived from the Intel-HLS/GKL project (Context.h), which was released under the MIT license:
+
+    https://github.com/Intel-HLS/GKL