Add redfish schema link

Another thing I point people to a lot as a starting point
for their redfish work

Change-Id: I679dc12287bfa7d12f6e791ef0f31b1480d8190a
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
diff --git a/DEVELOPING.md b/DEVELOPING.md
index ff49b96..6a920bc 100644
--- a/DEVELOPING.md
+++ b/DEVELOPING.md
@@ -206,6 +206,8 @@
   The following redfish schemas and fields are targeted for OpenBMC.  This is a
   living document, and these schemas are subject to change.
 
+  The latest Redfish schemas can be found [here](https://redfish.dmtf.org/schemas/)
+
   Fields common to all schemas
 
   - @odata.context