Add features and technical details about puzzl

Author: pravj

README.md

@@ -28,6 +28,35 @@ export PATH=$PATH:$GOPATH/bin
 * Press 'h' or 'H' to get any hint for next move.
 * Press ESC key to quit the game.
 
+####Features
+* puzzl comes with an [in-built solver](#in-built-solver) that powers the automation for the game.
+* puzzl gives you some hope by showing the optimal possible moves to solve any board configuration.
+* puzzl helps you survive the game by giving [hints](#hints-policy) for next move.
+* puzzl tracks all the user moves and accordingly generates [score](#scoring-policy) for the game.
+* puzzl shows [notifications](#notification-mechanism) according to the real time game status.
+* puzzl notifies that whether your last move was right or wrong.
+
+####In-built Solver
+* puzzl uses A-star algorithm to solve the game board.
+* puzzl's solver is enough fuel-efficient that it can solve the hardest 3x3 puzzle in 31 moves. Exactly what the [ideal solvability condition](http://en.wikipedia.org/wiki/15_puzzle#Solvability) asks for.
+
+####Hints Policy
+* You will get a maximum of 3 hints per game session. No more cheatings. :oncoming_police_car:
+
+####Scoring Policy
+* puzzl has its own scoring system. It measures the real time game score using two parameters, one is *total played game moves (T-score)* and another is *accumulated correct score (A-score)* from all the moves.
+* Whenever a user moves in a correct direction as the solver would have moved, the *A-score* increases by 1 and decreases by 1 when the user moves in a wrong direction.
+* The score of game at any point of time is calculated by this function. [ score = A-score / T-score ]
+* This way the maximum score of 1 would be possible in only one situation when the user traverse the game's state space in the right direction all the time.
+
+####Notification Mechanism
+* puzzl uses a combination of *goroutines* and *channels* to deliver real time notifications in the game.
+* Here you can see all the [available notifications](https://github.com/pravj/puzzl/blob/development/notification/notification.go#L5-L14).
+
+####Dependencies
+* [termbox-go](https://github.com/nsf/termbox-go) - Text based graphic user interface for the game.
+* [Box-drawing characters](http://en.wikipedia.org/wiki/Box-drawing_character) for drawing different sections.
+
 ---
 
 Built with *Muzi* and *Coffee* by [Pravendra Singh](https://twitter.com/hackpravj)