Merge README.TXT into README.md

README.md

@@ -19,14 +19,39 @@ The main features include:
 
 Read more about it on the [OpenRocket Wiki](http://wiki.openrocket.info).
 
+Running OpenRocket
+------------------
+To start the software from the JAR file run:
+```
+$ java -jar OpenRocket-<VERSION>.jar
+```
+
 License
 -------
 
-OpenRocket is an Open Source project licensed under the [GNU GPL](http://openrocket.sourceforge.net/license.html). This means that the software is free to use for whatever purposes, and the source code is also available for studying and extending.
+Copyright (C) 2007-2020  Sampo Niskanen and others
+
+OpenRocket is an Open Source project licensed under the [GNU GPL](https://www.gnu.org/licenses/gpl-3.0.en.html). This means that the software is free to use for whatever purposes, and the source code is also available for studying and extending.
 
 Contributing
 ------------
 
 OpenRocket needs help to become even better. Implementing features, writing documentation and creating example designs are just a few ways of helping. If you are interested in helping make OpenRocket the best rocket simulator out there, please [click here for information on how to get involved!](http://openrocket.sourceforge.net/getinvolved.html)
 
- 
+**Contributors**
+Sampo Niskanen, main developer
+Doug Pedrick, support for RockSim designs, printing
+Kevin Ruland, Android version
+Bill Kuker, 3D visualization
+Richard Graham, geodetic computations
+Jason Blood, freeform fin set import
+Boris du Reau, internationalization
+
+**Translators**
+Tripoli France
+Tripoli Spain
+Stefan Lobas / ERIG
+Mauro Biasutti
+Sky Dart Team
+Vladimir Beran
+Polish Rocketry Society / Łukasz & Alex Kazanski