On GitHub, I created a ReadMe.md with screenshots
but when I publish the website, it doesn't show the image. I used

and
<img src="https://raw.github.com/username/projectname/branch/path/to/img.png" alt="https://raw.github.com/username/projectname/branch/path/to/img.png">
But nothing works. What format can I insert images where it will display on both ReadMe.md and the Webpage?
Link ReadMe.md: https://github.com/Sonihal/moveclient/blob/master/README.md
Link to Webpage: http://sonihal.github.io/moveclient
Your website is trying to load images from the wrong link:
<img src="https://github.com/Sonihal/moveclient/blob/master/group_name_and_id.JPG" alt="https://github.com/Sonihal/moveclient/blob/master/group_name_and_id.JPG">
You should update it to use the raw image link in github:
https://raw.githubusercontent.com/[USER]/[REPO]/[BRANCH]/[PATH_TO_IMAGE]
Example: https://raw.githubusercontent.com/Sonihal/moveclient/master/group_name_and_id.JPG
In Readme.md
file, you can use both because it seems Github markdown understands it and wrap it automatically to get the image.