Routes:
- http://localhost:8000/api/posts/ GET: Get all Posts POST: Create a new Post with title,username and body of Post
- http://127.0.0.1:8000/api/posts/int:id GET: Get Post by ID PUT: Update a Post By ID DELETE: Delete a post by ID
- http://127.0.0.1:8000/api/posts/int:id/comments/ GET: get all comments for Post with ID POST: Create a new comment for Post with ID
- http://127.0.0.1:8000/api/posts/int:id/comments/int:id2 GET: get comment by ID PUT: update comment with ID DELETE: Delete Comment