Create README.md

Author: shyamalu

README.md

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+Prerequisites:
+    Install cocos2d-x according to the procedure listed at http://www.cocos2d-x.org/docs/installation/Android-terminal/
+    In the Android SDK:
+      Edit sdk/tools/ant/build.xml
+      Uncomment the below line:
+      <!--<nocompress extension="xml" />-->
+      and change it to
+      <nocompress extension="webm" />
+    Prepare a Google Pixel C tablet with 6.0.1 Android version and unlocked boot loader
+      
+cd goa
+cocos run -p android -m release
+
+The apk will be generated at goa/publish/TODO
+Step 1: In a shell on a Mac or Linux PC, in a user writeable directory, create a directory called my_userdata, with a subdirectory called app. Copy your APK(s) to the app directory
+
+Step 2: run
+sudo make_ext4fs -l 30720M -s -a userdata ./userdata.img my_userdata
+
+...where 10240M is the size you want your partition to be.
+
+NOTE: Do not include directories other than the "app" directory.
+
+Flash the userdata.img to the Google Pixel C by using fastboot flash userdata userdata.img