Add per-directory synopsis.

[apitrace] / retrace / README.markdown

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+The source for replaying retraces lives in this directory.
+
+There are actually several discting layers in this directory which should be eventually be split out:
+
+ - `*`retrace -- deserialization and interpretation of calls from a trace
+
+ - `*`ws -- windowing system helpers and abstractions
+
+ - `*`state -- dumping of state into JSON format