[Findit] Re-org code.

appengine/findit/gae_libs/README.md

Index: appengine/findit/gae_libs/README.md
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+# gae_libs
+
+The [gae\_libs](gae_libs) module is for shared code that depends on App Engine
+APIs (gae is short for Google App Engine), eg: an NDB model that supports
+keeping multiple versions of the same information like configuration.
+
+It also depends on the sibling [libs](libs) module, and provides gae wrappers
+for the code there, e.g., a Gitiles client with data cached in memcache on App
+Engine.
+
+# How to use?
+
+Create symbolic links to both [gae\_libs](gae_libs) and [libs](libs) in the same
+directory PARENT\_DIR, and ensure that PARENT\_DIR is in sys.path or PYTHONPATH.
+
+The usage would look like: `from gae_libs import API_MODULE_NAME`