Add a directory for proposed specifications
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/docs/proposed/README b/docs/proposed/README
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+The documents in this directory are proposed specifications for Mbed
+TLS features. They are not implemented yet, or only partially
+implemented. Please follow activity on the `development` branch of
+Mbed TLS if you are interested in these features.