Readme.md: Add CI build status badges
    
    https://bugzilla.tianocore.org/show_bug.cgi?id=2315
    
    Update Readme.md with status badges from the most recent
    EDK II Continuous Integration(CI) build.
    
    Cc: Andrew Fish <afish@apple.com>
    Cc: Laszlo Ersek <lersek@redhat.com>
    Cc: Leif Lindholm <leif.lindholm@linaro.org>
    Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
    Acked-by: Laszlo Ersek <lersek@redhat.com>
    Reviewed-by: Liming Gao <liming.gao@intel.com>
    Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>