Added some documentation.
Added some documentation.

FR4NK-W/osourced-scion,netsec-ethz/scion,netsec-ethz/scion,netsec-ethz/scion,FR4NK-W/osourced-scion,Oncilla/scion,klausman/scion,klausman/scion,dmpiergiacomo/scion,klausman/scion,Oncilla/scion,FR4NK-W/osourced-scion,dmpiergiacomo/scion,klausman/scion,dmpiergiacomo/scion,dmpiergiacomo/scion,netsec-ethz/scion,Oncilla/scion,FR4NK-W/osourced-scion,dmpiergiacomo/scion,dmpiergiacomo/scion,klausman/scion,Oncilla/scion,FR4NK-W/osourced-scion