Desert notes after retiring the alternative renders; mod documentation

test_suites/desert/manifest.json

@@ -0,0 +1,6 @@
+{
+  "name": "Desert and supply barrel test",
+  "description": "West/east transitions, one-time barrel loot, save/load and both desert monster battles.",
+  "sources": ["src/*.cs"],
+  "depends": ["rpg_plus_game>=1", "ff_battle>=1"]
+}