[Findit] Re-org code.

appengine/findit/predator/README.md

Index: appengine/findit/predator/README.md
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+# Code structure
+
+* [analysis](analysis): Core of analysis for Chrome crashes.

[wrengr, 2016/11/10 21:20:35]

-> "Core library for analyzing Chrome crashes."

[stgao, 2016/11/14 23:30:51]

Done.

+* [app](app): The App Engine modules to provide core services of Predator.

[wrengr, 2016/11/10 21:20:35]

-> "The AppEngine application for invoking the library to analyze Chrome
crashes."

Or something to that effect. The code under ./app isn't just "modules" but the
whole AE application/client. Also, I think using "services" here is misleading,
since that word has a technical meaning within AE. Plus, there isn't really a
"core" set of analyses distinct from peripheral analyses.

[stgao, 2016/11/14 23:30:51]

Done. Removed "modules" and "services" as they might be confusing especially
both App Engine and Python have the concept "modules" while it has completely
different meanings for them.

+
+# Refactoring guideline
+* All core logic of analysis should live in [analysis](analysis), and it should
+  be standalone, and not depend any App Engine APIs.
+* All app-layer code should live in [app](app)
+  * Frontend code rendering UIs to providing APIs for clients like
+    ClusterFuzz/Fracas/Cracas should live in [app/frontend](app/frontend).
+  * Backend code running the analysis should live in [app/backend](app/backend).
+  * Shared code between the frontend and backend should live in [app/common](app/common).
+
+# Next step
+  When the refactoring is done, we will do a one-off move to appengine/predator.