Added base template for config ui.

appengine/config_service/ui/README.md

Index: appengine/config_service/ui/README.md
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+# \<Config UI\>
+
+This is a UI for the configuration service
+
+## Install the Polymer-CLI
+
+First, make sure you have the [Polymer CLI](https://www.npmjs.com/package/polymer-cli) installed. Then run `polymer serve` to serve your application locally.

[turakulov, 2017/06/08 01:22:00]

Markdown files should not have lines longer than 80 chars
https://github.com/google/styleguide/blob/gh-pages/docguide/style.md#characte...

+
+## Viewing Your Application
+
+```
+$ polymer serve
+```
+
+## Building Your Application
+
+```
+$ polymer build
+```
+
+This will create builds of your application in the `build/` directory, optimized to be served in production. You can then serve the built versions by giving `polymer serve` a folder to serve from:
+
+```
+$ polymer serve build/default
+```
+
+## Running Tests
+
+```
+$ polymer test
+```
+
+Your application is already set up to be tested via [web-component-tester](https://github.com/Polymer/web-component-tester). Run `polymer test` to run your application's test suite locally.