Include README.xxx.md information in documentation (suggestion only)

[Locutu5]

Steps to reproduce

Can't reproduce because the information is not in the documentation

Expected behaviour

See the README.xxx.md information in the documentation instead of looking through the code.

Actual behaviour

Have to look at the README.xxx.md files in the source code to find the extra information

Version information

Operating system agnostic

Ubertooth tools version: same as Github master

libbtbb version: irrelevent

Ubertooth firmware version: same as Github master

[straithe]

Thank you for opening this issue. I hope to resolve it in the next two months.

[straithe]

I'm going to replicate the following documents into the docs folder:
host/README.md
host/README.btle.md
host/python/specan_ui/README