Update readme

README.org

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 * About
 This package is a core api for GateRunner card game.
+** Gameplay
+ During game player should go through *levels* thats consist of lines of *doors*.
+ Every line have three *doors* and player free to open any of them to skip line.
+ When player interacts with the *door* it turn into *event*.
 
+ Every interaction take some *move points* of player. Amount of move points
+ necessary passing a *door* depends on *ground*.
+
+ Player pass the level if it skip all lines with *move points* and *health*
+ greater than zero.
+
+ *Event* can be ether of:
+ - empty
+ - item
+ - trap
+ - enemy
+
+*** Empty *event*
+  Player just pass whole line when interacts with event.
+  More difficult level is, less empty events it have.
+*** Item *event*
+*** Trap *event*
+*** Enemy *event*
 * Plan
 ** TODO Describe domain
 ** TODO Implement domain and operations over domain elements