Description

User can create new categories (through postman). Frontend portion sent as a separate pull request.

Closes #6

Type of change

Please delete options that are not relevant.

[ ] Bug fix (non-breaking change which fixes an issue)
[X] New feature (non-breaking change which adds functionality)
[ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
[ ] This change requires a documentation update

In terminal, run

watchgod request_handler.main

In postman, under the POST tab,

http://localhost:8088/categories in body > raw

{
    "label": "new_label_here"
}

Successful creation returns the created object.

To view labels, in SQL file, run

SELECT * FROM Categories;

[X] My code follows the style guidelines of this project
[X] I have performed a self-review of my own code
[X] I have commented my code, particularly in hard-to-understand areas
[X] My changes generate no new warnings or errors
[X] I have added test instructions that prove my fix is effective or that my feature works