Add rule documentation of the rule UseShouldProcessForStateChangingFunctions

Author: yutingc

RuleDocumentation/UseShouldProcessForStateChangingFunctions.md

@@ -0,0 +1,30 @@
+#UseShouldProcessForStateChangingFunctions
+**Severity Level: Warning**
+
+##Description
+
+Functions that have verbs like New, Start, Stop, Set, Reset that change system state should support 'ShouldProcess'
+
+##How to Fix
+
+To fix a violation of this rule, please add attribute SupportsShouldProcess. eg: [CmdletBinding(SupportsShouldProcess = $true)] to the function.
+
+##Example
+
+Wrong:
+```
+	function Get-ServiceObject
+	{
+	    [CmdletBinding()]
+    	    param ([string]$c)
+	}
+```
+
+Correct: 
+'''
+	function Get-ServiceObject
+	{
+	    [CmdletBinding(SupportsShouldProcess = $true)]
+	    param ([string]$c)
+	}
+'''