title: How to add a local project to asdf configured by quicklisp
body: <p>I want to add a local project to the known projects by asdf, but due to the fact that asdf was installed and configured by quicklisp and the <code>*central-registry*</code> points to "#P/home/user/quicklisp/quicklisp/", which contains .lisp files. I do not know how to do it as the <a href="http://common-lisp.net/project/asdf/asdf/Configuring-ASDF.html" rel="noreferrer">manual</a> explains that a symbolic link into the directory would do it, but I do not want to mess around inside quicklisp. (It does work as a hotfix, though!)</p>
  
  <p>Therefore:How to add a local project to asdf (NOT QUICKLISP) which was installed and configured by quicklisp? </p>