Update README.md

README.md

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-# short_url
+# 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"
+It's recommended to use a reverse proxy like nginx to manage SSL certificates etc.
+//good luck