Add README

README.md

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+# Fail2ban Analyze
+
+Analyze fail2ban logs to find most common ip's and plot histogram of access rates.
+
+## Example usage
+Plot the histogram of the access hits
+```
+zcat /var/log/fail2ban.log* | ./fail2ban-analyze.py histogram
+```
+Rank IPs by bans, first 20 results
+```
+zcat /var/log/fail2ban.log* | ./fail2ban-analyze.py rank 4 --only-bans --count 20
+```
+Rank all IPs by bans, clobber by first 2 subnets
+```
+zcat /var/log/fail2ban.log* | ./fail2ban-analyze.py rank 2 --only-bans --count 20
+```