Generating  project MyPkg:
    MyPkg\Project.toml
    MyPkg\src\MyPkg.jl

.:
total 1
drwxr-xr-x 1 genkuroki genkuroki  0 Sep 26 18:14 MyPkg
-rw-r--r-- 1 genkuroki genkuroki 72 Sep 26 18:14 Untitled.ipynb

./MyPkg:
total 1
-rw-r--r-- 1 genkuroki genkuroki 126 Sep 26 18:14 Project.toml
drwxr-xr-x 1 genkuroki genkuroki   0 Sep 26 18:14 src

./MyPkg/src:
total 1
-rw-r--r-- 1 genkuroki genkuroki 66 Sep 26 18:14 MyPkg.jl