Maintainer.txt: Add Chao to be co-maintainer of SignedCapsulePkg
Maintainer.txt: Add Chao to be co-maintainer of SignedCapsulePkg

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Zhang, Chao B <fed49a7a524fbe970930fd44cd2de5a9d4952d81@intel.com>
Reviewed-by: Jiewen Yao <364a90bfebd1f362ebb7b48e4bf8ec010adef203@intel.com>
Cc: Jiewen Yao <364a90bfebd1f362ebb7b48e4bf8ec010adef203@intel.com>

MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2