Add sage module stack to INSTALL.md

INSTALL.md

@@ -55,6 +55,14 @@ Please load the following modules before configuring/building, to ensure `libfab
 Do not use one of the `craype-network-ofi\*` modules at this time.
 `libfabric` builds nicely with CCE 9.0.
 
+### sage prototype
+Please load the following modules before configuring/building.
+
+```
+module use $CLIENT_MOD_PATH
+module swap gnu GCC/9.3.0
+module load Autotools git binutils pkg-config libreadline
+```
 
 ## Calling autoreconf