Chocolatey support (#337)
* Added Chocolatey related scripts and empty README.md to document all the process
* Included correct description
* Update README.md
Note: this change may be reviewed later
* Fixes to Chocolatey automation scripts
* Updated devtoys.nuspec
* Fixed typo in chocolateyInstall.ps1
* Added Chocolatey to repository README.md
* Fixes to pass Chocolatey review
* Added chocolatey/README.md
* Removed WebFile download, AU will include .Msixbundle
* Applied WebFile download again
* Updated packageSourceUrl with new value related to Chocolatey files in repo
* Update Chocolatey README.md
