Change webapk packages and directory structure

web_apks/minting_example/libs/runtime_library/src/README

Index: web_apks/minting_example/libs/runtime_library/src/README
diff --git a/web_apks/minting_example/libs/runtime_library/src/README b/web_apks/minting_example/libs/runtime_library/src/README
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-The runtime library contains the implementation of the Web APK service. It
-implements functionality which Chrome delegates to the Web APK such as
-displaying notifications. The library is loaded by a ShellAPK which
-contains the Web APK's manifest and code to load the runtime library.
-
-The latest version of the runtime library is
-extracted from Chrome's APK by the ShellAPK when the Web APK service is created.
-Since the ShellAPK is updated asynchronously, the runtime library may run within
-an old ShellAPK. For instance, the ShellAPK's Android manifest may be missing
-some of the permissions that the runtime library is expecting.
-
-As the runtime library code does not execute in any of Chrome's processes, and
-runs in a separate application/process, it must not depend on anything in Chrome
-including //base.