doc changed

DOC/create_fact.txt

+
+in gadget: use Factadder
+
+factadder adds the fact to the server, use standard method AddFactIfNotFound
+
+fact: fact to add
+samestep: if the fact belongs conceptually to the previously added one
+
+Fact.cs: Caches all facts
+
+see  TestFact as an example
+parseFact interprets new MMT fact.
+

DOC/create_gadget.txt

+
+1.) create gadget class derived from Gadget in Assets\Scripts\InteractionEngine\Gadgets
+
+2.) add into enum in Gadget class in Assets\Scripts\InteractionEngine\Gadgets\Gadget.cs
+3.) add into dictionary in Gadget class in Assets\Scripts\InteractionEngine\Gadgets\Gadget.cs
+4.) add a line into the json-definitions at the start of: Assets\Scripts\InteractionEngine\Gadgets\Gadget.cs
+
+	-> follow examples, recommendation: always use the class name 
+
+5.) go into: Assets\ScriptableObjects\Gadgets
+6.) create Scriptable Object in Assets\ScriptableObjects\gadgets
+7.) add into Assets\ScriptableObjects\Gadgets\GadgetDataContainerGadgetCollection
+8.) in Assets\ScriptableObjects\Gadgets\GadgetDataContainerGadgetCollection add new Element into "Gadget Data" and
+    "Gadget Type" [same element index]
+9.) In "Gadget Data" insert the ScriptableObject you created
+10.) in "Gadget Type" insert the enum of the gadget you created
+
+-> in the ScriptableObject you created you can customize your gadget
+	- Rank: Position in toolbar
+	- UI Name: name of your gadget
+	- Button Indx:  sets the index of the sprite that is used as the icon in the toolbar,
+			you can find the indices in Assets\ScriptableObjects\Gadgets\GadgetDataContainerGadgetCollection,
+			as "Button Sprites", all possible sprites are in Assets\Scripts\InventoryStuff\Items\images
+			
\ No newline at end of file