Add a 'How to verify no telemetry' section to the README

[iliyami]

We claim Mac Clean has zero telemetry. We should help users verify this themselves.

Task

Add a short section to README.md (under "Why Mac Clean isn't notarized") titled "Verify no telemetry yourself" with copy-pasteable shell commands:

# 1. Grep for any URLSession / network APIs in the source
grep -rn 'URLSession\|NSURLConnection\|URL(string:' Sources/ --include='*.swift' | grep -v '//'

# 2. Watch the app's network activity live with Little Snitch / lsof
lsof -i -P | grep MacClean

Expected result: zero network calls from the running app.

Why this matters

Most CleanMyMac users left because of telemetry concerns — letting them verify our claim is itself a viral hook.

Files to change

• README.md