1. Connect to Gmail.
2. Fetch Unread Email and store the following information in DB
3. Simple list of email from and subject and on click the subject show content of email in html format with attachment and inline images.

Note:

1. enable imap/pop for the specific email whose unread email need to be stored like here https://support.google.com/mail/answer/7126229?hl=en

2. enable less secure apps like here https://myaccount.google.com/u/3/lesssecureapps