README.md

How to generate documentation:

Environment preparation

1. Make sure the following packages are installed:
	- doxygen
	- python3
2. Install python deps: `python3 -m pip install -r requirements.txt`

Doc generation

1. Generate docs by calling `./merge_doc.sh`
2. The following files should be re-generated:
	- man3/OneCCL.3
	- OneCCL.md