High level chrome-extension features

[prakhar1989]

• [ ] Login with FB
• [x] Fetching urls for a user
• [x] Posting a new URL for a user
• [x] Deleting an existing URL
• [x] Logic for valid pages (urls)
• [x] Reading product details from the webpage

[prakhar1989]

Tracking these tasks in standalone issues. Closing this for now.