Add PLDM feature documentation in README.md

Change-Id: I91ff87eb08052ffc003b4c2d651748d2f0f5361d
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/README.md b/README.md
index 3b88b31..4e07685 100644
--- a/README.md
+++ b/README.md
@@ -28,6 +28,7 @@
 * Local User Management(Redfish/IPMI)
 * DateTime
 * Event Logging
+* PLDM (Platform Level Data Model) via pldmtool
 
 **Debugging Supported List**
 * SOL collection
@@ -120,6 +121,8 @@
 
 `gui/`: Contains test cases for web UI and security scanning tool automation.
 
+`pldm/`: Contains test cases for platform management subsystem (base, bios, fru, platform, OEM).
+
 `snmp/`: Contains test cases for SNMP (Simple Network Management Protocol)
          configuration testing.