Update readme and fix some minor style issues.

README

@@ -3,3 +3,4 @@ Project to learn the vulkan API.
 Checkpoints:
 `42410890541d4cc67934ad383e49cfebab219d40`: first triangle rendering complete
 `2ee55ac3adae04d8a773a16220dc8f657f093ed8`: drawing a square with index buffers
+`ea5e4c9e6fcc910dab8d20cb43922387fe14944d`: rotating square with UBOs

src/main.c

@@ -1254,7 +1254,6 @@ void init_vulkan(ApplicationState* state) {
     create_index_buffer(state);
     create_uniform_buffers(state);
     create_descriptor_pool(state);
-    printf("creating descriptor sets\n");
     create_descriptor_sets(state);
     create_command_buffer(state);
     create_sync_objects(state);