Backend implementation of isAnswered feature, including isAnswered field in posts, storing answered status, adding logic/property to edit post data, and API endpoints

[eunseokk]

Issue #15
Backend implementation including:

• Adding isAnswered field to posts
• Storing answered status for post
• Adding isAnswered property into get Edit Post
• Adding logic to handle isAnswered in posts.edit
• Adding controller and routes (INCOMPLETE AND NOT PASSING)

Current Status:

• There is a error in creating the API endpoint, the tests are not running and the errors are in areas I can not seem to figure out how to debug. Tests will be added, but this does not solve the inherent issue.

Potential Next Steps:

• Debugging the API endpoint and integration into frontend
• Adding additional testing for the backend

Would like feedback for the commit up to fd84e7b

[VeronicaPim]

This part is good in fixing the linter errors.

[VeronicaPim]

actually you need to make sure to remove trailing spaces in this file - for example in line 2533:1 here.