endpoint to create a comment on a blog post

[myconpeter]

Fixes Issue/Linear Ticket

This could be an existing issue or a linear ticket

• Github Issue Example: My PR Closes Implement API Endpoint to Create Comment on Blog Post #205
• Linear Ticket Example: Fixes ID-Implement API Endpoint to Create Comment on Blog Post #205

Changes proposed

• create a blogCommentController
• update the blog.ts route

Talk about the things you did eg. files changes, dependencies installed e.t.c

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