Adds compatibility and license notes to the README.
Adds compatibility and license notes to the README.

onefrankguy/rogue-reversal,onefrankguy/rogue-reversal,js13kGames/Rogue-Reversal,onefrankguy/rogue-reversal,js13kGames/Rogue-Reversal,js13kGames/Rogue-Reversal