[Findit] Re-org code.

appengine/findit/libs/README.md

Index: appengine/findit/libs/README.md
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+# libs
+
+This [libs](libs) module is for shared & standalone code that has no dependency
+on AppEngine but just the standard python library. However, it should also be

[wrengr, 2016/11/15 00:38:01]

s/the (standard python library)/a $1/

[stgao, 2016/11/16 18:44:11]

Done.

+AppEngine-compatible -- could run on AppEngine. For example, writing to the file

[wrengr, 2016/11/15 00:38:01]

s/-- could/-- i.e., can be/

[stgao, 2016/11/16 18:44:11]

Done.

+system should be excluded (os.path is OK though).

[wrengr, 2016/11/15 00:38:01]

-> "For example, you must not write to the file system"

In specifications, "should" indicates a desired goal (which, in practice, may
fail to obtain); for absolute requirements/prohibitions, use "must" (or
"shall").

[stgao, 2016/11/16 18:44:11]

Good point.

+
+# How to use?
+
+Create a symbolic link to [libs](libs), and ensure that the containing directory
+of it is in sys.path or PYTHONPATH.
+
+The usage would look like: `from libs import API_MODULE_NAME`