Update samples README on how to run the bot

[tsuwandy]

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Is your feature request related to a problem? Please describe.
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Describe the solution you'd like
README today doesn't have any info on how to run the sample, ie:

1. Create LUIS app using the json file in cognitivemodels
2. Run pip install -r requirements.txt to install all dependencies
3. Update config.yaml with LUIS appid, key, endpoint
4. Run "python main.py"
   ...

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[enhancement]

[cleemullins]

Move to Python repo, once the Transfer button is working again.