Create Refactor.md

Author: Mehakjot

Refactor.md

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+### List of refactorings made
+
+* Remove unnecessary and unused variables.
+* Improve the Implementation of Grid User file by breaking into fragments and reusing the common elements from other files.
+* Removed redundant code from Battleship_Grid_Pane.java and merged its functionality with other features.
+* Player can now check itself if he has won or not instead of Game telling who is the winner.
+* Other minor refactorings suggested by IDE.
+
+### Methods used to determine points
+* Team Discussions
+* IDE suggestions
+* Peer programming
+
+### How to chose the targets
+
+* We checked if the refactor targets were backed by tests or not.
+* Refactorings were done in order to simplify the coding process and any possible future change which might be needed in Build 3.
+* For every phase, we checked if the code could be optimized.