update readme, add screenshot (thanks mckaygerhard)

README.md

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+minetest mod fire
+==========================
+
+Fire featured mod
+
+Information
+-----------
+
+This mod is named `fire`, it features work from original mod.
+This is improved for Chest drops and /fire (on|off) command too to
+disable propagation of fire destruction.
+
+![screenshot.png](screenshot.png)
+
+Technical informaton
+--------------------
+
+#### Dependencies
+
+* default
+
+#### Configuration
+
+* `enable_fire` - taken from minetest config file, bool type
+* `disable_fire` - taken from minetest config file, bool type
+
+The `disable_fire` is checked only if `enable_fire` is not defined,
+if configure enables or disables usage of fire and flames.
+
+#### nodes and tools
+
+| Name            | node                 | notes |
+| --------------- | -------------------- | ----- |
+| Basic flame     | fire:basic_flame     | it flames fro a while |
+| Permanent flame | fire:permanent_flame | always flaming |
+| Flint and Steel | fire:flint_and_steel | it burns flamable things |
+
+#### chat command
+
+| Command format   | Description                            | privilegies need |
+| ---------------- | -------------------------------------- | ---------------- |
+| `/fire <on|off>` | Disbles fire spreading when set to OFF | server           |
+
+Licence
+------
+
+**Source code**
+
+Originally by Perttu Ahola (celeron55) <celeron55@gmail.com> (LGPL 2.1)
+Various Minetest developers and contributors (LGPL 2.1)
+Chest drops and /fire (on|off) command additions by TenPlus1 (MIT)
+
+**Media (textures and model)**
+
+Everything not listed in here:
+Copyright (C) 2012 Perttu Ahola (celeron55) <celeron55@gmail.com> (CC BY-SA 3.0)
+
+Muadtralk (CC BY-SA 3.0)
+  fire_basic_flame_animated.png
+
+Gambit (CC BY-SA 3.0)
+  fire_flint_steel.png
+
+dobroide (CC BY 3.0)
+http://www.freesound.org/people/dobroide/sounds/4211/
+  fire_small.ogg
+
+Dynamicell (CC BY 3.0)
+http://www.freesound.org/people/Dynamicell/sounds/17548/
+  fire_large.ogg
+  fire_fire.*.ogg
+
+fire_small.ogg and fire_large.ogg are unused but kept temporarily to not break
+other mods that may use them.
+
+Benboncan (CC BY 3.0)
+https://www.freesound.org/people/Benboncan/sounds/66457/
+  fire_flint_and_steel.ogg
+
+Check [lisence.txt](lisence.txt)

README.txt

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-Minetest Game mod: fire
-=======================
-See license.txt for license information.
-
-Authors of source code
-----------------------
-Originally by Perttu Ahola (celeron55) <celeron55@gmail.com> (LGPL 2.1)
-Various Minetest developers and contributors (LGPL 2.1)
-Chest drops and /fire (on|off) command additions by TenPlus1 (MIT)
-
-Authors of media (textures and sounds)
---------------------------------------
-Everything not listed in here:
-Copyright (C) 2012 Perttu Ahola (celeron55) <celeron55@gmail.com> (CC BY-SA 3.0)
-
-Muadtralk (CC BY-SA 3.0)
-  fire_basic_flame_animated.png
-
-Gambit (CC BY-SA 3.0)
-  fire_flint_steel.png
-
-dobroide (CC BY 3.0)
-http://www.freesound.org/people/dobroide/sounds/4211/
-  fire_small.ogg
-
-Dynamicell (CC BY 3.0)
-http://www.freesound.org/people/Dynamicell/sounds/17548/
-  fire_large.ogg
-  fire_fire.*.ogg
-
-fire_small.ogg and fire_large.ogg are unused but kept temporarily to not break
-other mods that may use them.
-
-Benboncan (CC BY 3.0)
-https://www.freesound.org/people/Benboncan/sounds/66457/
-  fire_flint_and_steel.ogg