Develop the Email Box UI

[hieptl]

This PR fixes #

Checklist

• [x] I have signed the CLA
• [x] I have updated/added any relevant documentation

Description

What's the goal of this PR?

• Develop the UI for the email box.

What changes did you make?

• Add a new email template.
• Create self-identification.js file.

What alternative solution should we consider, if any?

• none.

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[hieptl]

Thank you for your patience and for considering all my comments, Hiep! I don't see anything else that I think needs to be addressed here.

I am learning a lot from you. Thank you so much for your feedback!