Merge pull request AzureAD#8 from AzureAD/fix-patch-response

Fixed the Patch method HTTP return code

Add contributing file

Merge pull request AzureAD#7 from AzureAD/AH-Copyright

Add copyright links

Merge pull request AzureAD#6 from AzureAD/security

Added token validation code for development and for publishing

Merge pull request AzureAD#5 from AzureAD/fix-conflictexception

Fixed exception handling for HTTP errors thrown by the provider

Merge pull request AzureAD#4 from AzureAD/webhost

Moved webhost outside the main library

Merge pull request AzureAD#3 from AzureAD/dependencies-cleanup

Removed references for EFCore as it's not needed.