This file is indexed.

/etc/init.d/README is in file-rc 0.8.16.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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        Configuration of Init under Debian GNU/Linux

Most Unix versions have a file here that describes how the scripts in
this directory work, and how /etc/runlevel.conf influences system
startup/shutdown.

For Debian, this information is contained in the policy manual,
chapter 9.3: system run levels.  The home site for the Debian Policy
Manual is at

http://www.debian.org/doc/debian-policy/ch-opersys.html#s-sysvinit

The Debian Policy Manual is also available in the Debian package
`debian-policy'.  When this package is installed, the policy manual can be
found in directory /usr/share/doc/debian-policy. If you have a browser
installed you can probably read it at
file://localhost/usr/share/doc/debian-policy/

Make sure you have at least version 3.5.4.0 of the policy manual.

Some more detailed info can also be found in /usr/share/doc/sysvinit,
/usr/share/doc/file-rc and in the man pages update-rc.d(8) and
runlevel.conf(5).