I followed an example in another repository and wrapped the directory structure within a pair of triple backticks (```
):
```
project
│ README.md
│ file001.txt
│
└───folder1
│ │ file011.txt
│ │ file012.txt
│ │
│ └───subfolder1
│ │ file111.txt
│ │ file112.txt
│ │ ...
│
└───folder2
│ file021.txt
│ file022.txt
```