Add Find-Resource cmdlet and test/help file

[vivsriaus]

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[amarzavery]

Can you provide a better example in the help message. It is very difficult for the customer to differentiate between ResourceType and ExtensionResourceType by reading the current help message. If you could provide a different example and let the user know when to use what, that would be helpful.

[vivsriaus]

Extension resource type is something that comes after the original/first resource type. For example: Microsoft.Sql/servers/testblahvivek23/databases/testdb2vivek123

I've added this example now, but this is something we'll need to fix across our cmdlets and make this more clearer in our help files. I'll send a separate PR for that.

[amarzavery]

LGTM

[amarzavery]

@vivsriaus - Your test is failing. http://azuresdkci.cloudapp.net/job/powershell/2859/artifact/src/Publish/TestResults/Microsoft.Azure.Commands.Resources.Test.html

Unable to find a matching record in the recordings file