rewrite readme in markdown, add more information

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+
+# ADVTRAINS – realistic trains in Minetest!
+by orwell96 and contributors (see below)
+
+[![builds.sr.ht status](https://builds.sr.ht/~gpcf/advtrains/commits/.build.yml.svg)](https://builds.sr.ht/~gpcf/advtrains/commits/.build.yml?)
+
+For up-to-date information, visit <https://advtrains.de/>
+
+License of code: GNU AGPL version 3
+License of media: CC-BY-SA 3.0
+
+(up to commit 1bb1d8 (2020-02-14), the license has been LGPL 2.1)
+
+## Installation
+
+To use advtrains, you need to install a mod providing trains. *Note
+that advtrains no longer comes bundled with any trains out of the
+box*. Some selected train mods by the authors of advtrains are:
+
+* [Basic trains](https://git.bananach.space/basic_trains.git/) by
+  orwell96, mbblp et al. The classic selection of trains for
+  advtrains, formerly included in the mod.
+* [Moretrains](https://git.bananach.space/moretrains.git) by rbduck,
+  with improvements by gpcf and Marnack. 
+* [dlxtrains](https://github.com/Marnack/dlxtrains_modpack) by Marnack
+
+
+Further information is available on the [wiki](https://advtrains.de/wiki/).
+
+
+## How to contribute
+
+* [Bug tracker](https://bugs.linux-forks.de/advtrains)
+* [Discussion and Support mailing list][srht-discuss]
+* Send patches via [git-send-email][gsm] to the [dev mailing
+  list][srht-devel]
+
+
+
+[srht-discuss]: https://lists.sr.ht/~gpcf/advtrains-discuss
+[srht-devel]: https://lists.sr.ht/~gpcf/advtrains-devel
+[gsm]: https://git-send-email.io/
+
+
+## Credits
+
+### Coding
+
+Various features and bugfixes have been contributed by:
+
+- gpcf
+- Blockhead
+- ywang
+
+Small code contributions:
+
+- hlqkj
+- Maverick2797
+- AntumDeluge
+- lemon-melon
+- mbblp
+- Andrey K
+- Hume2
+- Linus Jahn
+- Pedro Gimeno
+- Relatio
+- Thomas Rudin
+- h-v-smacker
+- imcasper
+- rubenwardy
+- techniX
+
+
+
+### Assets:
+
+* Gravel Texture              : from Minetest Game
+* Initial rail model/texture  : DS-minetest
+* Models for signals/bumpers  : mbb
+* Steam engine / wagon texture: mbb
+* Detailed Steam engine       : mbb / Krokoschlange(animation)
+* Industrial engine/wagons    : mbb
+* Inventory images            : mbb
+* Node texture for LuaATC controller: Jeija (from Mesecons)
+* Mod Description             : hajo
+
+#### Sounds:
+
+* advtrains\_crossing\_bell     : Codesound
+* advtrains\_japan\_horn        : Codesound
+* advtrains\_steam\_whistle     : googol 
+* advtrains\_subway\_horn       : https://freesound.org/people/Mullumbimby/sounds/385283/
+* advtrains\_subway\_\*          : Gabriel (gbl08ma)
+* 45 degree platforms design  : Och_Noe
+
+### Testers:
+
+* gpcf (Linuxforks server)
+* imcasper (tss Branch)
+
+
+If I forgot someone please punish me for that. Also see the Git commit
+log.
+
+You can see this mod in action on various minetest servers, including
+the Linuxforks minetest server.
diff --git a/readme.txt b/readme.txt
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-
-## ADVTRAINS ## realistic trains in Minetest!
-by orwell96 and contributors(see below)
-
-For up-to-date information, visit https://advtrains.de/
-
-License of code: GNU AGPL version 3
-License of media: CC-BY-SA 3.0
-
-(up to commit 1bb1d8, the license has been LGPL 2.1)
-
-Contributions:
-
-Coding:
-Various features and bugfixes have been contributed by:
-- gpcf
-- Blockhead
-- ywang
-Small code contributions:
-- h-v-smacker
-- NaruTrey
-
-Assets:
-Gravel Texture              : from Minetest Game
-Initial rail model/texture  : DS-minetest
-Models for signals/bumpers  : mbb
-Steam engine / wagon texture: mbb
-Detailed Steam engine       : mbb / Krokoschlange(animation)
-Industrial engine/wagons    : mbb
-Inventory images            : mbb
-Node texture for LuaATC controller: Jeija (from Mesecons)
-Mod Description             : hajo
-Sounds:
-advtrains_crossing_bell     : Codesound
-advtrains_japan_horn        : Codesound
-advtrains_steam_whistle     : googol 
-advtrains_subway_horn       : https://freesound.org/people/Mullumbimby/sounds/385283/
-advtrains_subway_*          : Gabriel (gbl08ma)
-45 degree platforms design  : Och_Noe
-
-Testers:
-gpcf (Linuxworks server)
-imcasper (tss Branch)
-
-
-If I forgot someone please punish me for that. Also see the Git commit log.
-
-You can see this mod in action on Linuxworks Next Generation server.