Update and install README.md

Limit line lengths. Add issue reporting and licensing paragraphs.
Add links.

Author: dg0yt

CMakeLists.txt

@@ -52,6 +52,10 @@ install(FILES "COPYING"
   RENAME COPYING.txt
   DESTINATION "${CMAKE_INSTALL_DOCDIR}"
 )
+install(FILES "README.md"
+  RENAME README.txt
+  DESTINATION "${CMAKE_INSTALL_DOCDIR}"
+)
 
 
 # Actual build

README.md

@@ -1,19 +1,49 @@
-**CupCalculator** is a program which calculates scorings from race results. It takes the runners' race times and calculates points for every runner (and optionally also for teams) according to a set of rules which are specified in advance. This makes the point calculation a matter of a few clicks.
+# OpenOrienteering CupCalculator
 
-A word of warning, though: **always** do a quick check of the calculated points before publishing them! I cannot take responsibility for incorrectly calculated points.
+**CupCalculator** is a program which calculates scorings from race results.
+It takes the runners' race times and calculates points for every runner
+(and optionally also for teams) according to a set of rules which are specified
+in advance. This makes the point calculation a matter of a few clicks.
 
+ - [CupCalculator Homepage](https://www.openorienteering.org/apps/cupcalculator/)
+ - [Downloads](https://github.com/OpenOrienteering/cupcalculator/releases)
+ - [OpenOrienteering Blog](https://www.openorienteering.org/)
 
-**Features**
 
-  * Import race times from [Sportsoftware](http://www.sportsoftware.de) CSV exports (OE 2003 / 2010 and OS 2003 / 2010)
+## Features
 
-  * Calculation of scorings for single races and series scorings, with adjustable settings including handicapping based on age
+  * Import race times from [Sportsoftware](http://www.sportsoftware.de) CSV
+    exports (OE 2003 / 2010 and OS 2003 / 2010)
+
+  * Calculation of scorings for single races and series scorings, with
+    adjustable settings including handicapping based on age
 
   * Recognition and correction of misspelled clubs & runner names
 
   * Presentation mode for prize giving ceremonies
 
-  * Calculated scorings can be exported as CSV, to be loaded into Excel / LibreOffice Calc to prepare the results as PDF
+  * Calculated scorings can be exported as CSV, to be loaded into Excel or
+    LibreOffice Calc to prepare the results as PDF
+
+  * Languages: English and German
+
+  * Cross-platform open source software
+
+A word of warning, though: 
+**Always** do a quick check of the calculated points before publishing them!
+We cannot take responsibility for incorrectly calculated points.
+
+
+## Reporting Issues and Asking for Help
+
+Issues and possible improvements can be posted to our public
+[Ticket system](https://github.com/OpenOrienteering/cupcalculator/issues).
+Please provide all relevant information about your problem or idea.
+
 
-  * Works on Windows and Linux (when compiled yourself); Languages: English and German
+## License
 
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, version 3 of the License, or
+(at your option) any later version.