help: document wire protocol "handshake" protocol
There isn't a formal handshake protocol in the wire protocol. But
clients almost certainly need to perform particular actions before they
can communicate with a server optimally. So document what that is
so people understand what's going on at connection establishment time.
Mercurial
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Mercurial is a fast, easy to use, distributed revision control tool
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$ make # see install targets
$ make install # do a system-wide install
$ hg debuginstall # sanity-check setup
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Running without installing:
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See https://mercurial-scm.org/ for detailed installation
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