edk2: jansson submodule for edk2 JSON library
    
    Add git submodule "jansson" library, which is the open
    source project (https://github.com/akheron/jansson) used
    to manipulate JSON data structure. jansson library is
    wrapped as edk2 JsonLib and the use cases will be the
    edk2 Redfish feature drivers and edk2 port of libredfish
    (https://github.com/DMTF/libredfish).
    jansson open source project is under MIT license.
    (refer to ReadMe.rst under edk2).
    
    Signed-off-by: Abner Chang <abner.chang@hpe.com>
    
    Cc: Andrew Fish <afish@apple.com>
    Cc: Laszlo Ersek <lersek@redhat.com>
    Cc: Leif Lindholm <leif@nuviainc.com>
    Cc: Michael D Kinney <michael.d.kinney@intel.com>
    Cc: Liming Gao <gaoliming@byosoft.com.cn>
    Cc: Nickle Wang <nickle.wang@hpe.com>
    Cc: Peter O'Hanley <peter.ohanley@hpe.com>
    Reviewed-by: Nickle Wang <nickle.wang@hpe.com>
    Acked-by: Leif Lindholm <leif@nuviainc.com>
    Reviewed-by: Michael D Kinney <michael.d.kinney@intel.com>