add kata

5kyu/count-ip-addresses/description.md

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+Implement a function that receives two IPv4 addresses, and returns the number of addresses between them (including the first one, excluding the last one).
+
+All inputs will be valid IPv4 addresses in the form of strings. The last address will always be greater than the first one.
+
+Examples
+* With input "10.0.0.0", "10.0.0.50"  => return   50 
+* With input "10.0.0.0", "10.0.1.0"   => return  256 
+* With input "20.0.0.10", "20.0.1.0"  => return  246