Add rule documentation for useoutputtypecorrectly

Author: Quoc Truong

RuleDocumentation/UseOutputTypeCorrectly.md

@@ -0,0 +1,37 @@
+#UseOutputTypeCorrectly 
+**Severity Level: Warning**
+
+
+##Description
+
+If a return type is declared, the cmdlet must return that type. If a type is returned, a return type must be declared.
+
+##How to Fix
+
+To fix a violation of this rule, please check the OuputType attribute lists and the types that are returned in your code. You can get more details by running “Get-Help about_Functions_OutputTypeAttribute” command in Windows PowerShell. 
+
+##Example
+
+##Example
+Wrong:
+
+	function Get-Foo
+	{
+	    [CmdletBinding()]
+            [OutputType([String])]
+            Param(
+            )
+            return "4
+	}
+
+Correct:
+
+	function Get-Foo
+	{
+	    [CmdletBinding()]
+            [OutputType([String])]
+            Param(
+            )
+
+            return "bar"
+	}