Author CRUD Implementation

Please note: read the guideline before starting.

In this task, you should implement full CRUD API the Author model.

The Author model has the following fields:

• first_name (with the max_length of 64);
• last_name (with the max_length of 64);
• pseudonym (with the max_length of 64, can be null);
• age (integer field);
• retired (boolean field).

Please note: you should also modify the author/urls.py file to make things work.