added readme

Readme.md

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+# How to
+
+## build
+
+```bash
+$ ./gradlew clean build
+```
+## run 
+
+_Note for Windows users: use **chess.bat**_
+
+Print usage:
+```bash 
+./build/distributions/chess-1.0.0-SNAPSHOT/bin/chess
+```
+
+It will be printed: 
+```
+Usage: <main class> [options]
+  Options:
+    -c, --chessboard-size
+      Size of chessboard
+      Default: 8
+  * -f, -e, --finish, --end
+      Finish square
+    -p, --piece
+      Type of piece
+      Default: Knight
+      Possible Values: [King, Knight]
+    --debug, --print-statistic
+      Print statistic after solution
+      Default: true
+  * -s, --start
+      Start square
+```
+
+Example of run: 
+```
+./build/distributions/chess-1.0.0/bin/chess -e b3 -s h5
+```
+
+Output should be 
+```
+h5 -> g7 -> e6 -> c5 -> b3
+
+Iterations 398
+
+Result chessboard.
+  [] - start 
+  {} - finish
+   a	b	c	d	e	f	g	h	
+   -	-	-	-	-	-	-	-	
+8| 5	4	5	4	5	4	5	6	
+7| 4	3	4	3	4	5	4	5	
+6| 3	4	3	4	3	4	5	4	
+5| 2	3	2	5	4	3	4	[5]	
+4| 3	4	3	2	3	4	5	4	
+3| 4	{1}	4	3	4	3	4	5	
+2| 3	4	3	2	3	4	5	4	
+1| 2	3	2	5	4	3	4	5	
+```
+
+
+
+
+# Description
+
+
+Create a Java application that should represent an empty chessboard where the user will be able to enter a starting position and an ending position. The application should then calculate a list of all possible paths that one knight piece in the starting position could take to reach the ending position in 3 moves. Some inputs might not have a solution, in this case the program should display a message that no solution has been found. Otherwise, the shortest path (if that exists) should be returned.
+
+Please note:
+- Although a graphical display would be welcome, this is not required. 
+- Input can be given by the command line, a text file or whatever you might prefer.
+- Output could also be kept simple: just print out the path in a textual format (i.e. A2 -> B5 etc) 
+- Emphasis will be given on the algorithm, general code structure and how the program could be extended.
+- Unit tests would be highly appreciated