Docs: follow the Install and Verify steps on a clean phone and report confusing parts #4

The README's Install and
Verifying a release sections were written by
people who already know the project. We would like a fresh reader to test them, because install instructions are the
first thing every user depends on.

What to do

1. Without asking anyone, follow the README from the top on a phone that has never had MeshLive. Note every place you
   hesitated, had to guess, or where the screen on your phone did not match the text (browser, manufacturer skin,
   Android version).
2. Try at least the hash check, and the certificate check if you are comfortable with apksigner. If you have the
   GitHub CLI, try gh attestation verify as shown in the README.
3. Comment here with what was unclear, or open a pull request that fixes the wording. Small pull requests are fine:
   typos, a missing step, an out-of-date screenshot, a term that needs explaining.

Also useful: a short glossary for words the README uses without explaining (GATT, CoC, relay, hop, attestation), and
extra questions for the FAQ that you would have asked.

The privacy warning at the top of the README must stay as it is; if you think it is unclear, say so in a comment
rather than editing it.