Can you suggest me a sample library in which I can find every Guitar Chord played on an acoustic guitar?
Even the not-so-popular ones like
if it does not exist, how do I create my samples?
Not quite a sample library, but check out the Ample Guitar VST (assuming you're using a VST compatible DAW). There's a huge amount of flexibility in it.
Usage isn't quite the same as a normal instrument VST, as the keyboard 'keys' trigger different commands, so take the time to read the docs/manual.