If you have what you are referring to in your repo, you can do something like this.

<img src="/image/Meowmad-ali.png" alt="Meowmad Ali Cat">

Here would be the tree structure of the folders.

This would be using relative paths, with the file path in the image folder and selecting the file name.

.
├── image/
│   └── Meowmad-ali.png
├── README.md
└── index.html

Depending on what code editor you are using, you can probably just click on the file and copy the relative file path.