How to create a nice post form like the ones in forum or in stack overflow? [closed]

I am currently building a forum app in my website from scratch with django.

I am quite happy with the result so far however I want to improve it.

So far, when users want to post a message they need to fill a simple text form : my app

Because it's only a simple text field, users can not use emojis, images or add links and the layout looks terrible. It does not look pro and any other forum would embbed a richer message form.

How can I make it look like the one from stack overflow ? : my goal

Thanks in advance.