test: add known broken test for reply to message with multiple Cc headers

[notmuch] / test / corpora / README

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+This directory contains email corpora for testing.
+
+default
+  The default corpus is based on about 50 messages from early in the
+  history of the notmuch mailing list, which allows for reliably
+  testing commands that need to operate on a not-totally-trivial
+  number of messages.
+
+broken
+  The broken corpus contains messages that are broken and/or RFC
+  non-compliant, ensuring we deal with them in a sane way.