Help with Readme

I want to make a Readme file better with adding things like Buttons and cool images, would I need to use HTML And CSS and Javascript for backend or can I just use MD If so how?

Markdown (or GFM) has no native support for any buttons, but has support for images. I believe you can put HTML in your Markdown, at least certain tags seem to work well. You can get creative with them, a quick Google search reveals.