Update README.md documentation for new support

Added:
     - redfish mode only transition parameter
     - support statement for POWER and x86 systems

Change-Id: Ieaeb455b68f981853e6ca7abc38b9eaface0a1aa
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/README.md b/README.md
index 7657420..203b002 100644
--- a/README.md
+++ b/README.md
@@ -88,6 +88,13 @@
  - [Code Update](https://github.com/openbmc/openbmc-test-automation/blob/master/docs/code_update.md): Currently supported BMC and PNOR update.
  - [Certificate Generate](https://github.com/openbmc/openbmc-test-automation/blob/master/docs/certificate_generate.md): Steps to create and install CA signed certificate.
 
+## Supported Systems Architecture ##
+
+  OpenBMC test infrastructure is proven capable of running on:
+  - POWER
+  - x86
+  systems running OpenBMC firmware stack.
+
 ## Testing Setup Steps ##
 
 To verify the installation setup is completed and ready to execute.
@@ -152,6 +159,8 @@
 `redfish/extended/`: Contains test cases for combined legacy REST and DMTF Redfish-related
                      feature supported on OpenBMC.
 
+Note: Work in progress test developement parameter `-v REDFISH_SUPPORT_TRANS_STATE:1` to force
+      the test suites to execute in redfish mode only.
 
 
 ## Quickstart ##