Update COLLABORATION_AGREEMENT.md

COLLABORATION_AGREEMENT.md

 # Collaboration agreement
-The aim of the CORSIKA project is to creat a scientific, and collaborative software framework as a fundamental tool for research. The collaborative agreement and licinsing scheme are based on the guidelines layed out by HSF~[1](https://hepsoftwarefoundation.org/activities/licensing.html) and CERN~[2](https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=2ahUKEwiLqKG00dXdAhUOZFAKHdIwAh4QFjAAegQIARAC&url=https%3A%2F%2Findico.cern.ch%2Fcategory%2F4251%2Fattachments%2F101%2F505%2FOSL-2012-01-Open_Source_Licences_at_CERN-Short_version.pdf&usg=AOvVaw1n4S0PQCSeE6wbdfdhKDqF),[3](http://legal.web.cern.ch/licensing/software), and follow the examples of other big scientific software projects. 
+The aim of the CORSIKA project is to creat a scientific, and collaborative software framework as a fundamental tool for research. The collaborative agreement and licinsing scheme are based on the guidelines layed out by HSF~[[1]](https://hepsoftwarefoundation.org/activities/licensing.html) and CERN~[[2,](https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=2ahUKEwiLqKG00dXdAhUOZFAKHdIwAh4QFjAAegQIARAC&url=https%3A%2F%2Findico.cern.ch%2Fcategory%2F4251%2Fattachments%2F101%2F505%2FOSL-2012-01-Open_Source_Licences_at_CERN-Short_version.pdf&usg=AOvVaw1n4S0PQCSeE6wbdfdhKDqF),[,3]](http://legal.web.cern.ch/licensing/software), and follow the examples of other big scientific software projects. 
 
 ## The software license of the CORSIKA project
 The license adopted by the CORSIKA project will be the explicit coyleft licencse GPLv3, as copyied in full in the file [LICENSE](LICENSE). 
@@ -8,7 +8,7 @@ The license adopted by the CORSIKA project will be the explicit coyleft licencse
 For legal reasons and the ability to maintin the CORSIKA project effectively over a very long lifespan of several decades, all contibuters are required to yield their copyright to the CORSIKA project, and it decision making stucture, as defined in this document. 
 
 ## Definition of a contributor, and software author
-All contributors will be co-listed as software authors of the CORSIKA project, and listed indefinitely in the [AUTHORS] file. 
+All contributors will be co-listed as software authors of the CORSIKA project, and listed indefinitely in the [AUTHORS](AUTHORS) file. 
 
 ## Definition of a scientific author
 The scientific authors and contributors of the CORSIKA project are people, where the Collaboration decides.