Add privacy policy

PRIVACY.md

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+#Privacy Policy
+
+##What information does this extension collect?
+
+- This extension collects search queries when you enter text into the search box in the toolbar.
+- This extension also collects search queries when you select text on a website, right-click on the selected text and then click the "Search Jisho.org for..." option in the context menu.
+- This extension does not store search queries that you have entered in the past. Search queries are discarded immediately after use.
+- This extension does not collect or store any user data other than search queries.
+
+##How does this extension use/disclose your information?
+
+- Search queries are transmitted to Jisho.org for the purpose of displaying the Jisho.org search results page in a new browser tab.
+- Search queries are not transmitted to any third party other than Jisho.org.
+- Search queries are not sold to any third party.