To find how to add support for a new programming language to KDevelop
please read the API documentation generated by doxygen at:

http://www.kdevelop.org/
or
http://api.kde.org/4.x-api/kdevplatform-apidocs/language/duchain/html/Implementing.html

or generate it yourself:

look at HACKING

or read the file:

doc/api/HowToAddProgrammingLanguages.dox