URL shortener Project added.

Projects/3-Advanced/URL-Shortener.md

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+# URL Shortener
+
+**Tier:** 3-Advanced
+
+We want to implement a URL shortener service.
+Input is a URL and output is a random unique code which is alias to the URL.
+
+So if you give a code to the app, it gives you the original URL.
+
+You can save records in a database or in a text files.
+
+## User Stories
+
+-   [ ] User can enter a URL and get a short code.
+-   [ ] User can enter a short code format and get original URL.
+
+
+## Bonus features
+
+-   [ ] User can see the stats of shortened URL (like number of visits and so on)
+- [ ] User can provide a prefered code name to URL (You must check the code is exists or not)
+
+
+## Useful links and resources
+
+[URL Shortening - wikipedia](https://en.wikipedia.org/wiki/URL_shortening)
+
+## Example projects
+
+- [bitly.com](https://bitly.com/)
+- [bl.ink](https://bl.ink/)
+