LDAP test invocation readme update

Change-Id: I0de88dea42c61d9d099733c8d2dce6552a91be55
Signed-off-by: Sivas SRR <sivas.srr@in.ibm.com>
diff --git a/README.md b/README.md
index c45827f..bd9e6bc 100644
--- a/README.md
+++ b/README.md
@@ -214,6 +214,17 @@
     robot -v OPENBMC_HOST:x.x.x.x -v GUI_BROWSER:gc -v GUI_MODE:header gui/obmc_gui/test/
     ```
 
+* Run LDAP tests:
+
+    Before using LDAP test functions, be sure appropriate LDAP user(s) and group(s) have been created on your LDAP server.
+    Note: There are multiple ways to create LDAP users / groups and all depend on your LDAP server.
+    One common way for openldap is ldapadd / ldapmodify refer https://linux.die.net/man/1/ldapadd
+    For ldapsearch, refer to "https://linux.die.net/man/1/ldapsearch".
+    Microsoft ADS: refer to  https://searchwindowsserver.techtarget.com/definition/Microsoft-Active-Directory-Domain-Services-AD-DS
+    ```
+    robot -v OPENBMC_HOST:x.x.x.x v LDAP_SERVER_URI:<ldap(s)//LDAP Hostname / IP> -v LDAP_BIND_DN:<LDAP Bind DN> -v LDAP_BASE_DN:<LDAP Base DN> -v LDAP_BIND_DN_PASSWORD:<LDAP Bind password> -v LDAP_SEARCH_SCOPE:<LDAP search scope>  -v LDAP_SERVER_TYPE:<LDAP server type>  -v LDAP_USER:<LDAP user-id> -v LDAP_USER_PASSWORD:<LDAP PASSWORD> -v GROUP_NAME:<Group Name> -v GROUP_PRIVILEGE:<Privilege> ./test_user_ldap_management.robot
+    ```
+
 * How to run CI and CT bucket test:
 
     Default CI test bucket list: