Add link to the Open Source Software Collaboration Counseling

The Open Source Software Collaboration Counseling exists since 2010. The OSSCC tries to serve the same purpose as CAL:

> To simplify license selection, we provide the OSSCC license interoperability guide together with a commented list of preferred OSS licenses.
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> The OSSCC also tries to provide a platform to support collaboration between existing currently separate OSS entities and to politically support OSS.
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> The OSSCC is currently a group of volunteering people located in Germany and Norway but we are looking for more contributors and staff members worldwide.