The READ ME is not in the game folder itself.
Upon opening the Tiny Terror Package file, you should see 2 folders and a Text Document. The first is the folder "Art of TT", the second is "Tiny Terror Game Files", and the Text Document is "TT READ ME". That text document is the READ ME referenced in the credits.
I've checked the current uploaded version and the file is included, so if you continue to not see it I can re-publish just in case ^^