Add Redis docs

docs/REDIS.md

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+# Redis backend
+
+I introduced Redis support for store information about attacks.
+
+Please call ```redis-cli``` and input following commands
+
+```bash
+keys *
+1) "10.10.10.200_flow_dump"
+2) "10.10.10.200_information"
+3) "10.10.10.200_packets_dump"
+```
+
+Basic information about attack (stored immediately)
+```get 10.10.10.200_information```
+
+Complete flow dump for attack if flow tracking enabled (stored immediately)
+```get 10.10.10.200_flow_dump```
+
+# Complete per packet attack dump (stored with some delay; can be absent in some cases of slow attacks)
+```get 10.10.10.200_packets_dump```
+
+