Add a feature to mail students who click on know more

[tend2infinity]

Related Issue

We will mail the students who click on know more on a teacher's card

Closes: #[issue number that will be closed through this PR]

Describe the changes you've made

Give a clear description what modifications you have made

Type of change

What sort of change have you made:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Enhancement in the existing features
• Other

Mention any unusual behaviour of your code (Write NA if not)

Any unusual behaviour of your code

Checklist:

• My code follows the guidelines of this project.
• I have performed a self-review of my own code.
• I have commented my code, particularly whereever it was hard to understand.
• My changes generate no new warnings.
• I have verified/tested my code by running it locally.

Additional Info (optional)

Any additional information you want to give

[github-actions]

@tend2infinity Thank you for Opening pull request. We will get back to you as soon as possible. Your patience is greatly appreciated! Thanks! 🥳.
PS: Please double check that you linked the corresponding issue.