Please clarify which branch or start tagging build versions

[btgoodwin]

It's unclear what is the best, most stable potential starting point for compiling the library. For example:

1. The master branch readme says to use the m104_release branch.
2. The m104_release branch readme says to use the m97_release branch.
3. The m97_release branch readme says to use the M92 branch from a different repository.
4. And so forth...

It's very unclear exactly what branching and versioning strategy is being used here given that each branch recommends building a different branch.

[cloudwebrtc]

Sorry for the vague readme, I will update the readme later,
The current status is
you should use the master branch of libwebrtc, I will delete mxxx_release in libwebrtc repo later
libwebrtc@master corresponds to https://github.com/webrtc-sdk/webrtc/tree/m104_release