add doc for gpt2 embellish model

add gpt2 (non-fast transformer) stage2 ckpt

link to github repo

Merge branch 'main' of https://huggingface.co/slseanwu/compose-and-embellish-pop1k7 into main

update title and tag

add model weights

complete model characteristics

complete datasets

zip LMD dataset to workaround errors

add model and paper info

Create README.md

initial commit