initial guidance

guidance/README.md

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+Guidance for Memory Hole Implementors
+=====================================
+
+## Implementation patterns
+
+ * interpretation/display of protected headers
+
+ * generation of protected headers
+
+## UI/UX
+
+How to distinguish signed headers from unsigned headers?
+
+How to indicate to users that the header lines they see were encrypted
+(and what to do with the unencrypted versions)
+
+## Baseline
+
+Subject-only
+
+## more sophisticated
+
+stripping To:/Cc:
+
+stripping From:
+
+stripping Message-Id:
+
+stripping In-Reply-To:, References:, etc
+
+
+## search/display
+
+protected lookaside header store for rendering