Rewrite README to proper markdown and better readability

README.md

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-minetest-skinsdb
+# skinsdb
 
-An skin extention for the Minetest.
+This Minetest mod offers changeable player skins with a graphical interface for multiple inventory mods.
 
-Features:
+## Features
-  - a flexible Skins-API to manage a skins database
-  - character_creator supported as "custom skin" possible
-  - Inventory tabs in sfinv and unified_inventory to select the skins
-  - Smart_inventory uses the skinsdb for skins selection
-  - Skin previews supported in selection
-  - Skin metadata supported showing the selected skin
-  - Support for different skins lists. Currently implemented a public list and per-player lists trough skin filenames
-  - Full 3d_armor support
-  - Previews are used in 3d_armor selection
-  - skins download scripts included for the Minetest skin database. (http://minetest.fensta.bplaced.net)
 
-To download the latest there are 3 tools available in "updater" folder:
+- Download scripts included for the [Minetest skin database](http://minetest.fensta.bplaced.net)
- "./update_skins_db.sh"    bash and jq required
+- Flexible skins API to manage the database
- "./update_from_db.py"     python3 required
+- [character_creator](https://github.com/minetest-mods/character_creator) support for custom skins
- "MT_skins_updater.exe"    windows required
+- Skin change menu for sfinv (in minetest_game) and [unified_inventory](https://forum.minetest.net/viewtopic.php?t=12767)
+- Supported by [smart_inventory](https://forum.minetest.net/viewtopic.php?t=16597) for the skin selection
+- Skin previews supported in selection
+- Additional information for each skin
+- Support for different skins lists: public and a per-player list are currently implemented
+- Full [3d_armor](https://forum.minetest.net/viewtopic.php?t=4654) support
 
-Licenses:
---------
 
-cornernote:
+## Update tools
-  - Lua source code (GPLv3)
+
+In order to download the skins from the skin database,
+you may use one of the listed update tools below.
+They are located in the `updater/` directory.
+
+- `update_skins_db.sh` bash and jq required
+- `update_from_db.py` python3 required
+- `MT_skins_updater.*` windows or mono (?) required
+
+
+## License
+
+If nothing else is specified, it is licensed as GPLv3.
 
 Fritigern:
   - update_skins_db.sh (CC-BY-NC-SA 4.0)
 
-Krock:
+### Credits
-  - Lua source code (GPLv3)
-  - MT_skins_updater.exe (WTFPL)
 
-bell07:
+- RealBadAngel (unified_inventory)
-  - Lua source code (GPLv3)
+- Zeg9 (skinsdb)
-
+- cornernote (source code)
-Credits:
+- Krock (source code)
-  - RealyBadAngel unified_inventory
+- bell07 (source code)
-  - Zeg9 skinsdb