Add privacy policy.

doc/privacy.md

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+# Jira Minute7 Autocomplete Privacy Policy
+
+This extension requires access to the https://*.atlassian.net and https://frontend.minute7.com domains.
+
+Text entered into the description box on Minute7 is transmitted in real time to your specified Jira instance in order to retrieve suggestions where it may become subject to the [Atlassian Privacy Policy](https://www.atlassian.com/legal/privacy-policy).
+
+This extension stores your provided Atlassian account information locally using your browser's `storage` API.
+
+This extension does not store or transmit any other information.
+
+The source code for the extension is available for review at <https://github.com/StaflSystems/jira-minute7-autocomplete>.