Update README, use Markdown format

README.md

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+# Inventory Icon
+Version: 1.0.1
+
+## Description
+This simple mod adds an icon to the player's HUD at the bottom right corner.
+It shows how many inventory slots are available and how many of them are
+occupied.
+
+This mod also supports the Bags and Unified Inventory mods. If one of these
+mods are used, icons for each bag are displayed, too.
+
+## Licenses
+### Code
+The code is licensed under WTFPL.
+
+### Media files
+Licensed under CC-BY-SA 3.0 Unported.
+
+#### Authors
+* `inventory_icon_backpack_free.png`: DitsyDM and Traipse OpenRPG (CC-BY-SA 3.0 Unported)
+* `inventory_icon_backpack_full.png`: DitsyDM, Traipse OpenRPG and Wuzzy (CC-BY-SA 3.0 Unported)

README.txt

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-Inventory Icon
-==============
-Version: 1.0.1
-
-This simple mod adds an icon to the player's HUD which shows how many inventory slots are available and how many of them are occupied.
-
-This mod also supports the Unified Inventory mod. If this mod is used, icons for each bag are displayed, too.
-
-
-----------------
-
-License of code:
-WTFPL
-
-License of media files:
-CC-BY-SA 3.0 Unported
-
-Authors:
-- inventory_icon_backpack_free.png: DitsyDM and Traipse OpenRPG (CC-BY-SA 3.0 Unported)
-- inventory_icon_backpack_full.png: DitsyDM, Traipse OpenRPG and Wuzzy (CC-BY-SA 3.0 Unported)
-- inventory_icon_bags_small.png: Tonyka (New BSD License)
-- inventory_icon_bags_medium.png: Tonyka (New BSD License) 
-- inventory_icon_bags_large.png: Tonyka (New BSD License)