Add a privacy policy

PRIVACY.md

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+Privacy Policy for the Pinboard-Pin Add-On
+==========================================
+
+This add-on communicates with the [Pinboard](https://pinboard.in/) service using the [Pinboard API](https://pinboard.in/api) for the purpose of storing and updating bookmarks in your personal Pinboard account.
+
+In order to access your personal Pinboard account, your personal Pinboard API token is requested by the add-on and cached locally until you log out using the add-on. Your Pinboard password is not requested, accessed or stored by the add-on.
+
+In order to provide suggestions for tagging bookmarks, the add-on retrieves your tags stored in your personal Pinboard account using the Pinboard API and caches these tags locally.
+
+The data sent to the Pinboard service are the URL of the bookmarked link, its title, description, tags, and privacy and read status on Pinboard.
+
+If you activate the option "always check and show whether pages have been bookmarked" (which is deactivated by default), then the add-on checks for every tab whether it has been already bookmarked. For this purpose, it sends the URL of the tab to the Pinboard service using the Pinboard API.
+
+Please also read the [Pinboard privacy policy](https://pinboard.in/privacy/) for information on the privacy police of the Pinboard service itself.
+
+The author of this add-on is not affiliated with the Pinboard service in any way and does not take any responsibility for how the service handles your bookmarks.