info missing on custom-ux-sample

[padmick]

Please provide us with the following information:

This issue is for a: (mark with an x)

- [ ] bug report -> please search issues before submitting
- [ ] feature request
- [y] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)

Minimal steps to reproduce

clone repo and fill in the config.aad and bingmaps key, where to find the rest of the values is missing

Any log messages given by the failure

application fails to load

Expected/desired behavior

OS and Version?

Windows 10

Versions

latest pull

Mention any other details that might be useful

require info on where to get values for ###{APP_BUILDER_API_URL}### , ###{DISPLAY_RELEASE_VERSION}### and ###{REACT_APP_WEATHER_API_URL}### at https://github.com/Azure-Samples/blockchain-devkit/blob/master/connect/web/workbench/custom-ux-sample/src/common/config.js

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