The documentation is a bit verbose, but it is all in there.
Heres an example that uses a 3 functions to lessen the complexity a bit
https://forum.thegamecreators.com/thread/224567
1) Create a memblock
2) Set the memblock & vertex information at the start as per the documentation
3) Add some vertices (and some indices if you use them)
4) create the object from your memblock.
You could of course just create a plane object then convert it to a memblock and you then get pretty much what you are after. Just be aware that this will give you an object with 2 front triangles and 2 rear ones as well. The vertices / normals and texture coords will already be set.
