add support for deformable vs. deformable contact

examples/DeformableDemo/DeformableContact.cpp

@@ -0,0 +1,8 @@
+//
+//  DeformableContact.cpp
+//  App_BulletExampleBrowser
+//
+//  Created by Xuchen Han on 9/16/19.
+//
+
+#include "DeformableContact.hpp"

examples/DeformableDemo/DeformableContact.h

@@ -0,0 +1,13 @@
+//
+//  DeformableContact.hpp
+//  App_BulletExampleBrowser
+//
+//  Created by Xuchen Han on 9/16/19.
+//
+
+#ifndef DeformableContact_hpp
+#define DeformableContact_hpp
+
+#include <stdio.h>
+
+#endif /* DeformableContact_hpp */