I use the following to use picture inside the readme, It works however the picture size is small, can I control it somehow ?

I try as suggested here
But it doesnt work, I dont see the picture. Should I change the image type from png? something else ?
Not all flavors of Markdown support setting height and width of images. To be safe, Markdown supports HTML too, so instead you can use:
<img src="img/trk.png" alt="alt text" width="200" />