Add example screenshots to API.md

API.md

@@ -16,6 +16,8 @@
 
 ### Tabs
 
+![Screenshot of the inventory with the below example tab in focus.](res/api-tabs.png)
+
 #### `i4.new_tab(name, def)`
 
 - `name` is the tab name.
@@ -26,8 +28,8 @@ Custom tabs can be added to the `i4` inventory as follow (example):
 ```Lua
 i4.new_tab("stuff", {
 	description = "Stuff",
-	image = "image.png", -- Optional, add an image next to the tab description
+	image = "speech_icon.png", -- Optional, add an image next to the tab description
-	slots = true -- Optional, whether the inventory slots are shown or not. Disabled by default.
+	slots = true, -- Optional, whether the inventory slots are shown or not. Disabled by default.
 
 	--
 	-- The functions below are all optional
@@ -90,6 +92,7 @@ A list of registered tabs.
 ---
 
 ### Footer buttons
+![Screenshot of the inventory with the below example footer-button.](res/api-footer_button.png)
 
 `i4.new_footer_button(name, def)`