[client] added initial ivshmem client implementation

client/ivshmem/ivshmem.h

@@ -0,0 +1,13 @@
+#include <stdint.h>
+#include <stdbool.h>
+
+struct IVSHMEMInit
+{
+   int64_t version;
+   int64_t clientID;
+   int64_t unused;
+   int64_t sharedFD;
+};
+
+bool ivshmem_connect(const char * unix_socket);
+void ivshmem_close();