Added the official TF readme

no changes by me
Formatting updates
Comments

Some comment changes, also added a msg in case the server is forced to
increase timelimit (if timelimit < pm)
Menu / status changes

Disabled the new countdown menu by default since it's laggy. Must set
serverinfo newcountdown on to enable it. Also added serverinfo status
countdown/match/standby during relevant times. Will probably be changed
when pm is cut out and /ready is added.
Some practice stuff

Code currently commented off until later. Practice mode - concs will
have no effect. Maybe unlimited concs?
Next version will be 2.92beta