Add initial yarns for distix _list

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+Metadata manipulation
+=====================
+
+This chapter contains scenarios for testing the distix hidden commands
+for manipulation of metadata files.
+
+There are three commands, `_set`, `_get`, and `_list`, and they'll be
+tested together, since they interact with each other.
+
+    SCENARIO metadata manipulation
+    
+To start with, the `_list` command should give an error if the
+metadata file doesn't exist.
+
+    WHEN user attempts to run distix _list METADATA
+    THEN attempt failed
+    AND error message matches FIXME
+