Added README and changed binary to dotted binary

README.md

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+# Netcalc #
+This is a simple CLI network calculator made in PHP. Usage is pretty straight
+forward. For example, let say you want to know how many usable addresses you
+will get with a 26 bit netmask, simply run the script as below:
+
+    php netcalc.php 26
+
+The above command will give you the following outut:
+
+    Netmask
+    -------
+    In slash notation: 26
+    In dotted decimal: 255.255.255.192
+    In dotted binary: 11111111.11111111.11111111.11000000
+
+    Network size
+    ------------
+    Total number of addresses: 64
+    Number of usable addresses for hosts: 62
+
+## Copyright ##
+Netcalc is written by Jack-Benny Persson and released under GNU GPL version 2.
+
+