add docs

doc/function/import_image.txt

@@ -0,0 +1,13 @@
+Function: import_image
+
+--Usage--
+> import_image(image_path)
+
+Load an image from outside the data folder. Intended for use from the CLI.
+
+--Parameters--
+! Parameter	Type			Description
+| @input@	[[type:string]]		Full path of the image to load
+
+--Examples--
+> import_image("D:/Art/Ajani.png")

doc/function/index.txt

@@ -93,6 +93,7 @@ These functions are built into the program, other [[type:function]]s can be defi
 | [[fun:rotate_image]]		Rotate an image.
 | [[fun:drop_shadow]]		Add a drop shadow to an image.
 | [[fun:symbol_variation]]	Render a variation of a [[type:symbol]].
+| [[fun:import_image]]	Load an image from outside the data folder.
 | [[fun:built_in_image]]	Return an image built into the program.
 	
 ! Cards				<<<