add README file for ag mail

adguard-mail.com/README.md

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+
+# AdGuard Mail Documents
+
+- [eula.html.md](eula.html.md) - AdGuard Mail End-User License Agreement.
+- [privacy.html.md](privacy/app.html.md) - AdGuard Mail Privacy Notice.
+
+## List of documents in the footer
+
+- [EULA](eula.html.md)
+- [Privacy notice](privacy/app.html.md)
+
+All links to legal documents in the footer should be arranged alphabetically. The same applies to the list of other documents at the end of each legal document.
+
+For example, this is what it should look like when you open the Privacy policy:
+
+[EULA](eula.html.md)