Update README.md

README.md

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 # Rusty-Rover
 a simple host discovery program written in rust!
+
+# Usage
+-r target a single range given with commandline arguments.
+
+-f read a text file with ranges, one range per line, and scan them all.
+
+-o save the output to a file.
+
+rrover -r $ip_range to scan a single range
+
+rrover -f $path_to_range_file to scan a file of ranges
+
+NOTE: ranges should be in cidr notation.