Update readme.md

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captiveportal/firewall/readme.md

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 <h1>HOW TO USE</h1>
 Place the 2 files in the same folder (I recommend the root folder "/")
-You can initialize the script by typing: bash /rules.sh initialize
-You can grand an ip access to the internet by typing: bash rules.sh grand XXX.XXX.XXX.XXX (The ip adrress)
+You can initialize the script by typing: ```bash /rules.sh initialize```
+You can grand an ip access to the internet by typing: ```bash rules.sh grand XXX.XXX.XXX.XXX``` (The ip adrress)
 If you want the script to run at system stratup edit the /etc/rc.local and add <strong>before</strong> "exit 0" this code:<br>
-'''bash /rules.sh initialize'''
+```bash /rules.sh initialize```