doc: added public data sets with file

doc/sphinx/public-data-sets.rst

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+Public Data Sets
+================
+
+Collections of pcaps for testing, profiling.
+
+DARPA sets: http://www.ll.mit.edu/mission/communications/cyber/CSTcorpora/ideval/data/
+
+MAWI sets (pkt headers only, no payloads): http://mawi.wide.ad.jp/mawi/samplepoint-F/2012/
+
+MACCDC: http://www.netresec.com/?page=MACCDC
+
+Netresec: http://www.netresec.com/?page=PcapFiles
+
+Wireshark: https://wiki.wireshark.org/SampleCaptures
+
+Security Onion collection: https://github.com/security-onion-solutions/security-onion/wiki/Pcaps