Add mongoose model for topics

[ghost]

There are such fields:

• createdAt
• topic
• text

Also there is a list of comments:

• createdAt
• comment

[csmith111]

This is done. Please review before we close the topic.

[ghost]

You should have models in separate files: models/topic.js models/user.js

In future this files can be pretty large, because of instance and schema methods.

[csmith111]

I seperated the user into a file so I know how to split the schema across multiple files. The other file is still call forum.js since it contains the schema for both topics and comments. If this ok, then we can close this. You should see the files: models/forum.js models/user.js