add the README, which build-and-upload does not copy

Uploaded using `kernel-builder`.

Uploaded using `kernel-builder`.

Uploaded using `kernel-builder`.

Uploaded using `kernel-builder`.

Uploaded using `kernel-builder`.

Uploaded using `kernel-builder`.

Uploaded using `kernel-builder`.

Uploaded using `kernel-builder`.

Uploaded using `kernel-builder`.

Uploaded using `kernel-builder`.

initial commit