contrib bots: Rename bots to follow a consistent pattern.

Files renamed with few changes to accomodate the change in
path name of files. Fix few "at-mention bot" errors in docs.

contrib_bots/bots/tictactoe/readme.md

@@ -0,0 +1,34 @@
+# About Tic-Tac-Toe Bot
+
+This bot allows you to play tic-tac-toe in a private message with the bot.
+Multiple games can simultaneously be played by different users, each playing
+against the computer.
+
+The bot only responds to messages starting with @mention of the bot(botname).
+
+### Commands
+**@mention-botname new** will start a new game (but not if you are
+already playing a game.) You must type this first to start playing!
+
+**@mention-botname help** will return a help function with valid
+commands and coordinates.
+
+**@mention-botname quit** will quit from the current game.
+
+**@mention-botname <coordinate>** will make a move at the
+entered coordinate. For example, **@mention-botname 1,1** . After this, the bot will make
+its move, or declare the game over if the user or bot has won.
+
+Coordinates are entered in a (row, column) format. Numbering is from top to
+bottom and left to right.
+Here are the coordinates of each position. When entering coordinates, parentheses
+and spaces are optional.
+
+(1, 1)  | (1, 2) | (1, 3)
+
+(2, 1)  | (2, 2) | (2, 3)
+
+(3, 1)  | (3, 2) | (3, 3)
+
+Invalid commands will result in an "I don't understand" response from the bot,
+with a suggestion to type **@mention-botname help** .