Add basic API information

API.md

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+# API
+
+## APIs for adding simple things
+You can add simple things by calling functions in the various Outback mods.
+
+### Undocumented APIs
+You can also add stuff for the following things, but the APIs are currently undocumented. These 
+mods are very similar to Minetest Game.
+
+* Beds: See `mods/ITEMS/beds`
+* Buckets (for new liquids): See `mods/ITEMS/bucket`
+* Doors: See `mods/ITEMS/doors`
+* Fences and fence gates: See `mods/ITEMS/fences`
+* Panes (like glass panes and iron bars): See `mods/ITEMS/xpanes`
+* Stairs and slabs: See `mods/ITEMS/stairs`
+* Walls: See `mods/ITEMS/walls`
+
+## Mobs
+This mod uses Mobs Redo [`mobs`] by TenPlus1, a very powerful mod for adding mods of various kinds.
+There are minor modificiations for Outback compability and some items have been removed or moved to 
+other mods, but the API is identical to the original.
+You can add your own mobs, spawn eggs and spawning rules with this mod.
+API documnetation is included in `mods/ENTITIES/mobs/api.txt`
+
+Note that mob models and spawn in Outback have not been implemented yet and the use of the Mobs 
+Redo may change.
+
+## Other APIs
+* Statbars / HUD bars: See `mods/HUD/hudbars/API.md`
+* Hunger: See `mods/PLAYER/hb_hunger`
+
+## Other things of interest
+Mods found in `mods/CORE` contain important core APIs and utility functions, used throughout the 
+subgame.