Describe the stable-queue release process

Add a README file that describes how release candidates for stable
kernels are created and how users are expected to use them. This is
reworded from Greg's reply here:

        https://lore.kernel.org/stable/20190809085253.GA25046@kroah.com/

Link: https://lore.kernel.org/r/20190812090553.GA8903@ulmo
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/README b/README
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+This repository is the canonical source for patches that make up the stable
+kernel releases. It consists of a set of directories for each of the stable
+kernels, as well as a directory that contains a snapshot of the patches for
+each stable release.
+
+The patches for each release can be found along with a complete tarball of
+a release in the following location:
+
+       https://kernel.org/pub/linux/kernel/vX.Y/
+
+For each stable release candidate, a patch representing the diff of all the
+patches in the stable queue is uploaded here:
+
+       https://kernel.org/pub/linux/kernel/vX.Y/stable-review/
+
+As a convenience for people that want to test release candidates of stable
+releases, a branch of the kernel git tree is created containing all of the
+patches in the given stable queue. These branches are available in the
+following repository:
+
+       git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git
+
+A branch exists for each of the stable releases. Note, though, that these
+branches are recreated from scratch by applying the queued stable patches
+on top of the prior release. As a consequence, the branches are not fast-
+forward and can change after a release candidate has been announced. The
+contents of the branch may therefore not match exactly what was released
+as the release candidate, depending on when you fetch it. No tags are
+created to track individual release candidates. If you're interested in
+exact reproducibility of a stable release candidate, please use the patches
+from the location mentioned above.