Created publishing script and managedApp Template

[lwajswaj]

Added example Powershell script to simplify the publishing of a managedApp

[msftclas]

All CLA requirements met.

[krnese]

Thanks for the PR.
Can you pls look at our contribution guide, to ensure you have all files required to publish a managed app sample?
https://github.com/Azure/azure-managedapp-samples/blob/master/1-contribution-guide/README.md#contribution-guide

thx

[lwajswaj]

Just added README.md; be aware this is just a example or script to make the ManagedApp deployment easier and through powershell instead of using the portal