Add explicit README for configstore future goals. am: 31f5143c23 am: 3542341bbb
am: f157c2c418

Change-Id: Ie4c58f09d85bcbd84d58c379f872f9e6b04353ab
diff --git a/configstore/README.md b/configstore/README.md
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+Configstore is specifically the configuration for surface flinger. Other configurations go in other packages.