Update README.md

README.md

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 # short_url
 This is a simple application to short you urls with your own web server.
 It is based on Nodejs and Redis.
-You will have to change the IPs in the "index.js" and "./public/index.html" files to your public IP or domain.
-To start the server simply execute "index.js".
-f\e\: "screen -A -m -d -S short_url nodejs index.js"
+You will have to change the IPs in the `index.js` and `./public/index.html` files to your public IP or domain.
+To start the server simply execute `index.js`:
+```
+screen -A -m -d -S short_url nodejs index.js"
+```
 It's recommended to use a reverse proxy like nginx to manage SSL certificates etc.
 //good luck