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Quoted

Originally posted by octavian
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I dag more than half hour to find how to generate a library template project and I could not find the spot.
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There isn't a template for that, because initial choice for template is higher level than library/executable. Instead you are to choose language and library you want to use(though you can change that later).

However, after you do choose a project, you should use Automake Manager (right-side bar) to create targets (exec, lib, headers, etc.) which is what you want.

Quoted

Originally posted by octavian
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I skipped this and I picked whatever template seems to be much lighter
then I ran into another problem. I could not found a menu or an option
from where to add existent c++/hpp/c/h file to the project.
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Number of ways. I use C++ project, so I'll talk about that (you didn't mention which lang, you use )
1. Project->New Class
2. New class icon in the toolbar
3. File->New (source, header, etc.)

Hope this helps. Check the kdevelop manual as well. I've been using KDevelop for couple of years now. Love it.