Add SRV_STR Stuff

Service_Pgms/README.md

@@ -6,6 +6,10 @@ Utility Service Programs. This is probably the first code you want to explore be
 
     Contains procedures to send messages from an RPG program.
 
+* SRV_STR 
+
+    Contains procedures to manipulate strings in an RPG program.
+
 * CRTBNDDIR
 
    A CLLE program to create UTIL_BND, a binding directory for easy compiling of program that use SRV_MSG.
@@ -17,3 +21,8 @@ Utility Service Programs. This is probably the first code you want to explore be
 * SRV_MSGTD
   
   Display file used by SRV_MSGTR.
+
+* SRV_STRTR
+
+     RPG program to test the procedures in SRV_STR.
+