Split Exit/Rooms/Characters into seaprate doc pages. Describe desc templating. Resolve #3134

docs/source/Components/Rooms.md

@@ -0,0 +1,31 @@
+
+# Rooms
+
+**Inheritance Tree:**
+```
+┌─────────────┐
+│DefaultObject│
+└─────▲───────┘
+      │
+┌─────┴─────┐
+│DefaultRoom│
+└─────▲─────┘
+      │       ┌────────────┐
+      │ ┌─────►ObjectParent│
+      │ │     └────────────┘
+    ┌─┴─┴┐
+    │Room│
+    └────┘
+```
+
+[Rooms](evennia.objects.objects.DefaultRoom) are in-game [Objects](./Objects.md) representing the root containers of all other objects. 
+
+The only thing technically separating a room from any other object is that they have no `location` of their own and that default commands like `dig` creates objects of this class - so if you want to expand your rooms with more functionality, just inherit from `evennia.DefaultRoom`. 
+
+To change the default room created by `dig`, `tunnel` and other default commands, change it in settings: 
+
+    BASE_ROOM_TYPECLASS = "typeclases.rooms.Room"
+
+The empty class in `mygame/typeclasses/rooms.py` is a good place to start! 
+
+While the default Room is very simple, there are several Evennia [contribs](../Contribs/Contribs-Overview.md) customizing and extending rooms with more functionality.