update readme (thanks mckaygerhard)

readme.md

@@ -1,9 +1,78 @@
-Simple Skins
+minetest mod Simple Skins
+=========================
 
-Simple Skins mod for Minetest uses SFInv, Inventory Plus or Unified Inventory mods when
+Mod for skin appereance change of your player in a nice tab of your inventory
-available to allow players to select a skin/texture from the list.
 
-https://forum.minetest.net/viewtopic.php?id=9100
+Information
+------------
+
+Simple Skins is a mod that's so easy to use you'll wonder why it hasn't been
+done before... Just download and start to use it in your inventory.
+
+Must be named `simple_skins` and uses SfInv or Inventory Plus mods,
+and Unified Inventory if you use lasted original (master branch)
+version when available to allow players to select a skin/texture from the list.
+
+![screenshot.png](screenshot.png)
+
+Original forum https://forum.minetest.net/viewtopic.php?id=9100
+
+Technical Information
+---------------------
+
+This mod its more basic and minimalis, no preview and no download/upload, management,
+it target is to be light for huge servers and be minimal for better performance.
+
+Based on Zeg9's Skins mod originally from https://github.com/Zeg9/minetest-skins/ and
+with some help from PilzAdam. Also implements some minimal features backported from SkinDB
+like preview (disabled by default). The preview is autogenerated (2d), unless others mods.
+
+#### Download
+
+You can clone this repository in your minetest mods directory or in your game.
+
+#### Depends
+
+* default
+* sfinv (optional, autodetected)
+* player_api (newer version only)
+* inventory_plus (optional, autodetected)
+* unified_inventory (optional, autodetected)
+
+#### Skin management
+
+You can download a skin from skin database, set a new skin converted
+from others boxel games or create it from scrat.
+
+* **Download a mt-skin** It uses skins from Addi's **MT-Skin-DB**
+skin database, currently at http://minetest.fensta.bplaced.net/
+* **Download a mc-skind** Uses minecraft 1.7 skins, for 1.8+ will need newer 5.X mt,
+and some images must crop it from 64x64 to 64x32.
+
+To download a skin mt made or mc ones, just:
+1. go to the web page skin, and download it, will get you a `png` file,
+2. put into the textures directory and rename it accordingly e.g `character_2.png`
+3. pop into the meta directory and make a new `character_2.txt` empty file
+4. fill the txt file with as described in [Structure and formats](#structure-and-formats)
+
+If you use the skindb download tool, that already generates all
+the necessary files, with the requested names and formats. https://github.com/minetest-mods/skinsdb/tree/master/updater
+
+#### Structure and formats
+
+Each skin is made up of at least two files, a png file and a txt file,
+the "png file" is placed in the `textures` directory and
+the "txt file" in the `meta` directory.
+
+the format of the txt file is:
+
+. ```
+name = "Skin Name",
+author = "author that make the skin",
+. ```
+
+Change log:
+-----------
 
 Change log: