updated readme

[galenatjpl]

Purpose

• Updated README to remove "proposed" changes, since these have now been implemented, and to also improve and add to the documentation generally.

[mike-gangl]

I'll need to separate out the version/README checks in unity py from the build/test portions. The actions are run because changes to the health schema might mean breakage of the unity-py client. This is obviously not the case with a README update.

[galenatjpl]

@mike-gangl I didn't understand your comment above. I think you are referring to the 6 failing checks here. I haven't had time to look into what those exactly mean. The README should be benign of course, so we should probably just merge that in, as it improves documentation overall

[mike-gangl]

@mike-gangl I didn't understand your comment above. I think you are referring to the 6 failing checks here. I haven't had time to look into what those exactly mean. The README should be benign of course, so we should probably just merge that in, as it improves documentation overall

Exactly. a README update shouldn't do anything to unity-py.