Update README.md

README.md

 # netscan
 
-# Scans the specified network to find and list alive nodes.
+Scans the specified network to find and list alive nodes.
+
+    Syntax:  /usr/bin/python netscan.py [-n Network -p Port -f FilePath ] ...
+    
+    example: /usr/bin/python netscan.py -n 192.168.1.0/24 -p 22 -f /etc/output.json
+             /usr/bin/python netscan.py -n 192.168.1.16/30,192.168.2.2/32 -p 22 -f /etc/output.json
+    
+    args:
+    -h --help           Help.
+    -v --version        Shows version.        
+    -n --network        Network(S) to scan.
+    -f --file-path      File path containing file name to save the output.
+                        You can write the output in .csv, .txt or .json file formats.
+
+    © 2023 Hamid Sadeghian
+