add sixtyfps-cpp draft

api/sixtyfps-cpp/include/sixtyfps.h

@@ -0,0 +1,18 @@
+
+#include "sixtyfps_internal.h"
+
+namespace sixtyfps {
+
+    // Bring opaque structure in scope
+    using internal::ItemTreeNode;
+    using internal::ComponentType;
+
+    template<typename Component> void run(Component *c, const ComponentType *t) {
+        // FIXME! some static assert that the component is indeed a generated component matching
+        // the vtable.  In fact, i think the VTable should be a static member of the Component
+        internal::sixtyfps_runtime_run_component(t, reinterpret_cast<internal::ComponentImpl *>(c));
+    }
+
+    using internal::Rectangle;
+    using internal::RectangleVTable;
+}