Add privacy policy for Chrome Web Store listing

PRIVACY.md

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+# Privacy Policy
+
+KGet Capture does not collect, store, transmit, or sell any user data.
+
+## What the extension does
+
+When you right-click a link and choose "Download with KGet", or when
+auto-capture is on and Chrome starts a download, the extension sends that
+download's URL and filename to a native messaging host, a small helper
+program installed locally on your own computer (see
+[Install](README.md#install)). That helper hands the URL to KGet, the KDE
+download manager, over D-Bus, also entirely on your own machine.
+
+The only other data the extension stores is your auto-capture on/off
+preference, saved locally via the `chrome.storage.local` API. It never
+leaves your browser.
+
+## What never happens
+
+- No data is sent to any server operated by the developer or anyone else.
+- No analytics, tracking, or telemetry of any kind.
+- No data is sold, shared, or transferred to third parties.
+- No account, sign-in, or personal information is collected.
+
+## Source code
+
+KGet Capture is open source. You can review exactly what it does at
+[github.com/andwati/kget-capture](https://github.com/andwati/kget-capture).
+
+## Contact
+
+Questions about this policy can be raised via
+[GitHub Issues](https://github.com/andwati/kget-capture/issues).