README.md additition

[pvs043]

When I run Invoke-DscResourceTest at clean environment, this error occured:

PS C:\> Invoke-DscResourceTest
Unable to find type [Pester.OutputTypes].
At C:\Program Files\WindowsPowerShell\Modules\DscResource.Test\0.16.0\DscResource.Test.psm1:1628 char:9
+         [Pester.OutputTypes]
+         ~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (Pester.OutputTypes:TypeName) [], RuntimeException
    + FullyQualifiedErrorId : TypeNotFound

Problem resolved by running this command before use Invoke-DscResourceTest:

PS C:> New-PesterConfiguration

Run          : Run configuration.
Filter       : Filter configuration
CodeCoverage : CodeCoverage configuration.
TestResult   : TestResult configuration.
Should       : Should configuration.
Debug        : Debug configuration for Pester. ⚠ Use at your own risk!
Output       : Output configuration
TestDrive    : TestDrive configuration.
TestRegistry : TestRegistry configuration.

PS C:\> Invoke-DscResourceTest
cmdlet Invoke-DscResourceTest at command pipeline position 1
Supply values for the following parameters:
ProjectPath:

Please, update documentation.

[johlju]

I think the command should run Import-Module -Name 'Pester' unless the module is already loaded.

[johlju]

Hmm... Looking at the code the type is in the parameters, so my suggestion above won't work. So we need to update the documentation as suggested telling the user to import the module Pester prior to invoking the command.

Though, I see there is code to handle Pester 4, but will this work with Pester 4 when that type exist in the parameters... maybe the type exist i Pester 4 as well... 🤔