Added separate Privay Policy to satifisfy Store requiremets

PRIVACY.md

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+## Kiwix PWA Privacy Policy
+
+This Privacy Policy applies to the Kiwix JS Progressive Web App (Kiwix PWA) and versions of it packaged for the Electron, NWJS and UWP
+frameworks that are published on Kiwix servers, and by official Kiwix accounts on GitHub and other third-party vendor stores ("app stores"). 
+
+When installed, this application is capable of working entirely offline. It does not collect or record any of your personal data, though
+if you installed it from a Store, the Store operator may collect anonymous usage data (see below). The app only remembers your browsing
+history for the duration of a session (for the purpose of returning to previously viewed pages). This history is lost on exiting the
+app with the optional exception of the last-visited page.
+
+If you access this application from a secure web server (e.g. the PWA server), it will only work offline if your browser
+is capable of installing a Service Worker. If you install or bookmark the PWA version in ServiceWorker mode, then it
+will work offline, but note that **by design** any PWA will periodically check the PWA server (in this case, 
+https://pwa.kiwix.org/), if it is available, to check for an updated Service Worker.
+
+Versions of the app that are not installed via a Store or that are not PWAs, will offer to check the GitHub Releases API
+for updates on startup, but this functionality is optional and can be kept off. Some Electron apps will also optionally
+self-update (via the same API), if you allow them to check for updates. This applies to the installer (setup) version for
+Windows, and to the AppImage version for Linux. More Electron packages, in the future, may also auto update as that functionality
+is added. The Store version and the PWA also self-update, but this is not controllable within the app.
+
+By default, this application will remember your last-visited page between sessions using local stoarage or a cookie
+that is accessible only on this device. If you are accessing sensitive information that you do not wish to be displayed
+next time you open this app, we recommend that you turn this option off in the Configuration options.
+
+This application only reads the archive files that you explicitly select on your device and files included in its own
+package: it is not capable of reading any other files. It will only access the Kiwix archive download server if
+you specifically request it to access the download library for ZIM archives on the Configuration page. If you run the
+app as a PWA, it will cache its own code from the secure PWA server and then can be used offline. Some ZIM archives
+contain active content (scripts) which may, in rare circumstances, attempt to contact external servers for incidental files
+such as fonts. We block these with a Content Security Policy injected into articles, but in some cases, if the article already
+has a CSP, ours may be overwritten. Note that scripts only run if you enable Service Worker mode in Configuration.
+
+The Kiwix PWA server, like any server, retains access logs for security reasons, but these are erased when a new release
+causes the container to be rebuilt (usually once per month, but may be longer).
+
+**If you believe your Internet access is insecure, or is being observed or censored, we recommend that you completely shut
+down your Internet access (Data or WiFi) before using the application.**
+
+Additionally, if you obtained this app from a vendor store (including extensions), then the Store operator may track your
+usage of the app (e.g. download, install, uninstall, date and number/duration of sessions) for the purpose of providing
+anonymous, aggregate usage statistics to developers. If this concerns you, you should check the relevant Store Privacy Policy
+for further information.