Add a prominent "please read before using" block up top: it states plainly
that the bridge works against Tuta's end-to-end model and widens the attack
surface, links Tuta's own public stance, and frames who it is actually for
(advanced users who trust their device but not the provider). Simplify
Download (per-OS links to the latest release) and Getting started (three
steps plus a connection table). Remove every dash separator from the prose.
Add a download-and-run path for non-developers: per-OS install from the
Releases page (desktop app vs CLI binary, with the Gatekeeper / SmartScreen
one-time override each needs), a step-by-step getting-started with the
IMAP/SMTP connection table and Thunderbird / Apple Mail notes, and an
unofficial-&-unsigned disclaimer up top. Reframe the old cargo-centric
sections as 'Build from source', and document that body search covers
downloaded messages while metadata search covers the whole mailbox.
TutaBridge links Tuta's Rust SDK, which is part of the GPLv3-licensed
tutanota project, so the bridge must carry the same license. Add the
full GPLv3 text, set `license = "GPL-3.0-or-later"` on all three
crates, and note it in the README.
Anthony