Add README file
Add README file

    [Issue#]       SSDWSSP-528
    [Bug/Feature]  Added README file.
    [Cause]        N/A
    [Solution]     N/A
    [Verification] N/A

Change-Id: I00a8654ab2589013e4f8849352f7d8c231c8caf5

pohly/security-manager,pohly/security-manager,Samsung/security-manager,Samsung/security-manager,pohly/security-manager,Samsung/security-manager