How to I change the size of an image in Github/Markdown?

You can change the size of an image in GitHub markdown by using the image link in an HTML img tag:

From this:

![image](https://user-images.githubusercontent.com/link-to-your-image.png)

To this:

<img src="https://user-images.githubusercontent.com/link-to-your-image.png" width="200" />