docs: Create Documentation folder and add mboxd and mboxctl documentation

Create a separate folder for documentation called Documentation.

Move the protocol definition into a file in this folder called
mbox_protocol.md and update the README.md to explain the files in the
docs folder.

Also add two other files to the folder called mboxd.md and mboxctl.md
which document the operation of the reference implementations of the
mailbox daemon and the mailbox control program respectively.

Signed-off-by: Suraj Jitindar Singh <sjitindarsingh@gmail.com>
Change-Id: I9f818700ad1e36a396a828f0f085b42cc106b550

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