created CONTRIBUTORS.md

A place to say thanks to the people who support FlatPress.

CONTRIBUTORS.md

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+# FlatPress contributors
+FlatPress wouldn't be the great blogging system it ist without the help of many volunteers. Here is a list of people who contributed to FlatPress. __Thank you all very much!__
+
+If you think someone's missing here, please let us know.
+
+## The team
+FlatPress was initially developed by [Edoardo Vacchi (NoWhereMan)](http://www.nowhereland.it "nowhereland.it"). Edoardo was supported by [Hydra](http://hydra.clans.it/ "hydra.clans.it"), [drudo](https://drudotec.wordpress.com/ "drudotec.wordpress.com"), giulio, [alcor](http://alcor.altervista.org/ "alcor.altervista.org"), and [Tychondriax](http://tychondriax.altervista.org/blog/ "tychondriax.altervista.org").<br>
+<br>
+Since 2018, FlatPress is taken care of by [Arvid Zimmermann](https://arvidzimmermann.de "arvidzimmermann.de").
+
+## Coding
+- [Julian Rademacher](https://moortaube.de/) filed some useful pull requests (and donated his Twitter account [@FlatPress](https://twitter.com/FlatPress))
+- [Matthias Mauch](http://www.aadmm.org/)'s [FP-Patch](http://www.aadmm.org/fp-patch/) initially brought FlatPress to PHP 7.
+
+## Translation
+- Czech: [Lubomír Ludvík](http://flatpress.cz/)
+- French: [Marc Thibeault](https://github.com/MarcThibeault) and Dimitri Soufflet, fixed by Gee
+- German: [Matthias Mauch (laborix)](http://www.aadmm.org/)
+- Greek: An unknown, since deleted GitHub user :(
+- Japanese: [NORTH HILL WORK STUDIO](https://nhws.localinfo.jp/)