Composer self-built package

I searched a lot on the Internet, but I have doubts: After composerinit, the file will not be included in psr4 or psr0 automatic loading. I want to ask if you wrote the file yourself? Instead of being loaded by composer, I searched a lot on the Internet for the following section {code...}, but I have doubts:

After using composer init,
Files are not included in psr4 or automatically loaded by psr0.

I want to ask if you wrote it yourself? Instead of being loaded by composer.

See the following section.

"Autoload": {"psr-4": {"Ford \ Escape \": "src/Ford/Escape", "Ford \ Fusion \\": "src/Ford/Fusion", "Ford \ Focus \": "src/Ford/Focus", "Ford \ Fiesta \\": "src/Ford/Fiesta "}}

Reply content:

I searched a lot on the Internet, but I have doubts:

After using composer init,
Files are not included in psr4 or automatically loaded by psr0.

I want to ask if you wrote it yourself? Instead of being loaded by composer.

See the following section.

"Autoload": {"psr-4": {"Ford \ Escape \": "src/Ford/Escape", "Ford \ Fusion \\": "src/Ford/Fusion", "Ford \ Focus \": "src/Ford/Focus", "Ford \ Fiesta \\": "src/Ford/Fiesta "}}

I don't know if I try it!