added robots.txt file for the API

[MysteryManav]

Fixes

• Added robots.txt file

Fixes #3060 by @dhruvkb

Description

• Added robots.txt file to the api/templates folder

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[MysteryManav]

@dhruvkb @obulat I forgot to mention you in the PR, so I am doing this here

[dhruvkb]

This is great, everything works as expected and the file can be accessed at /robots.txt. Thanks for the contribution @MysteryManav! I only have 1 change request regarding an unused import.

[dhruvkb]

This bit is not necessary because we've already restricted all API endpoints to all bots (* on line 2). But we can keep it, no problems.

[dhruvkb]

This import should be removed so that lint check can pass. TemplateView is not used in the file so the linter complains that it should not be imported.