add README.md in root folder, based on README.txt

README.md

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+Magarena 
+========
+Homepage: http://magarena.github.io
+Forum   : http://www.slightlymagic.net/forum/viewforum.php?f=82
+
+Requires: Java Runtime Environment 7 (http://java.com) or above must be installed on your computer
+
+Starting Magarena:
+  On Windows, double click on Magarena.exe
+  On Linux, execute ./Magarena.sh. 
+  On Mac, double click the Magarena icon
+  
+Thanks to
+  ubeefx for creating such a great game
+  epiko for creating the Magarena logo and the amazing color themes
+  Salasnet, pedro1973, and elias for creating beautiful themes, http://www.slightlymagic.net/forum/viewforum.php?f=89
+  IcoJoy, http://www.icojoy.com/blogs/, for the nice free mage logo and icon
+  singularita for creating the scripts to add over 300 additional creature cards
+  glorfindel, Old Nick, David, Grundomu, jeffwadsworth, Kuno, LSK, sponeta,
+  day5ive, and Excedrin for contributing premade decks
+  mtgrares for the publicity
+  Goblin Hero for providing the images for some of the symbols
+  Melvin Zhang for implementing the Monte Carlo Tree Search AI and general code cleanup/bug fixes
+  IanGrainger for contributing a patch to allow text search in the Card Explorer
+  Rachel for making it possible to cancel image download and fixing incorrect images
+  beholder for implementing new cards and general usability improvements
+  johncpatterson for helping to test the Mac startup script
+  wait321 for creating a deck editor and other UI improvements
+  missalexis for creating an application bundle to improve Mac installation
+  goonjamin for contributing a patch that makes Magarena easier to use on touchscreens
+  Lodici for improving the duel screen and general UI enhancements
+  frank for extensive play testing and bug reporting
+  PalladiaMors, PhazedOut, Aunukia, nado18, Erkcan Özcan, kdesmond, a.
+  benedict balbuena, spartan vi, Braullynn, mecheng, pcastellazzi, rasdel,
+  Tyrael, hong yie, ember hauler, Hector Marin, drooone, jericho.pumpkin,
+  Mike, Guest, and ShawnieBoy for implementing new cards
+  http://mtgjson.com for card script data
+  http://mtgimage.com for card images
+  http://game-icons.net for UI icons
+  everyone on the CCGHQ forum, http://slightlymagic.net/forum/
+
+Thank you for your support and have fun!