Add bare-bones game structure with

* a games/ directory to hold specific runs of a game
  * a template/ directory to hold blank/starting-state game board files
  * a basic howto.md file describing how to play

games/board.md

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+| |A|B|C|
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+|1| | | |
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+|3| | | |
+

howto.md

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+**O** challenges by offering the first patch, a blank game board
+
+**X** accepts the challenge by 
+
+  * creating a new repository for the game
+  * applying the patch to that repository
+  * making the first move by editing the resulting game board
+  * generating a new patch, and 
+  * replying to the challenger with the newly-created patch
+

template/board.md

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+
+| |A|B|C|
++-+-+-+-+
+|1| | | |
+|2| | | |
+|3| | | |
+