QuarkPlatformPkg: Add Readme.md for QuarkPlatformPkg

QuarkPlatformPkg: Add Readme.md for QuarkPlatformPkg

Add a Readme.md for the QuarkPlatformPkg that describes how to
clone, build, boot, debug, and enable/disable features for the
Intel(R) Galileo Development Board and the Intel(R) Galileo Gen 2
Development Board.

Cc: Kelly Steele <kelly.steele@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Michael Kinney <michael.d.kinney@intel.com>
Reviewed-by: Kelly Steele <kelly.steele@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@19764 6f19259b-4bc3-4df7-8a09-765794883524