add some missing GRPC files

examples/SharedMemory/PhysicsClientGRPC_C_API.cpp

@@ -0,0 +1,29 @@
+#ifdef BT_ENABLE_GRPC
+
+#include "PhysicsClientGRPC_C_API.h"
+#include "PhysicsClientGRPC.h"
+#include "PhysicsDirect.h"
+#include <stdio.h>
+
+B3_SHARED_API	b3PhysicsClientHandle b3ConnectPhysicsGRPC(const char* hostName, int port)
+{
+
+	GRPCNetworkedPhysicsProcessor* tcp = new GRPCNetworkedPhysicsProcessor(hostName, port);
+
+	PhysicsDirect* direct = new PhysicsDirect(tcp, true);
+
+	bool connected;
+	connected = direct->connect();
+	if (connected)
+	{
+		printf("b3ConnectPhysicsGRPC connected successfully.\n");
+	}
+	else
+	{
+		printf("b3ConnectPhysicsGRPC connection failed.\n");
+
+	}
+	return (b3PhysicsClientHandle)direct;
+}
+
+#endif //BT_ENABLE_GRPC