Add privacy policy for Chrome Web Store listing

PRIVACY.md

@@ -0,0 +1,33 @@
+# 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).

README.md

@@ -176,6 +176,11 @@ Prebuilt releases are published on the
   observed in a non-finished state at least once, so it silently skips
   small/fast downloads that complete before that first observation.
 
+## Privacy
+
+KGet Capture doesn't collect, transmit, or store any user data. See
+[PRIVACY.md](PRIVACY.md) for details.
+
 ## License
 
 MIT, see [LICENSE](LICENSE).