Set properties for C

Signed-off-by: Martin Melik-Merkumians <melik-merkumians@acin.tuwien.ac.at>

sonar-project.properties

@@ -1,5 +1,8 @@
 sonar.projectKey=EIPStackGroup_OpENer
 sonar.organization=eipstackgroup
+sonar.language=c
+sonar.c.file.suffixes=.c,.h
+sonar.cpp.file.suffixes=.cc,.cpp,.cxx,.c++,.hh,.hpp,.hxx,.h++,.ipp
 sonar.coverage.exclusions=fuzz/**, source/tests/**
 
 # This is the name and version displayed in the SonarCloud UI.