Basically you need:
1) checkout SVN/GIT repository
2) place plugin sources to correct folder (trunk/plugins/)
3) open plugin solution in Visual Studio 2010/2013 (at least Express version)
4) fix project setup (especially include paths - you can copy them from another working plugin)
5) fix Miranda includes in sources to use our own (i.e. change #include "headers/m_something.h" or similar to format #include <m_something.h>) and delete these files from distribution with plugin
6) try to compile plugin and then fix errors one by one - mostly API changes (renamed/replaced methods - for example DBWriteContactSettingString() -> db_set_s(), constants, replaced some CallService(...) with direct method replacement, etc.)
But it's easier when you know the API changes so you don't need to search for it in other plugins... AFAIK unfortunately we don't have any API changes list.
I could adapt it for you, but only after exams (begin of february), maybe someone else could do it sooner :-) (or you can try it for yourself if you need)