add rule documents for dsc rules

Author: yutingc

RuleDocumentation/ReturnCorrectTypeDSCFunctions.md

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+#ReturnCorrectTypeDSCFunctions 
+**Severity Level: Error**
+
+
+##Description
+
+Set function in DSC class and Set-TargetResource in DSC resource must not return anything. Get function in DSC class must return an instance of the DSC class and Get-TargetResource function in DSC resource must return a hashtable. Test function in DSC class and Get-TargetResource function in DSC resource must return a boolean.
+
+
+##How to Fix
+
+To fix a violation of this rule, please correct the return type of the Get/Set/Test-TargetResource functions in DSC resource.
+
+
+##Example
+
+

RuleDocumentation/UseIdenticalMandatoryParametersDSC.md

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+#UseIdenticalMandatoryParametersDSC 
+**Severity Level: Error**
+
+
+##Description
+
+The Get/Test/Set TargetResource functions of DSC Resource must have the same mandatory parameters
+
+
+##How to Fix
+
+To fix a violation of this rule, please correct the mandatory parameters for Get/Set/Test functions in DSC resource.
+
+
+##Example
+
+

RuleDocumentation/UseIdenticalParametersDSC.md

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+#UseIdenticalParametersDSC 
+**Severity Level: Error**
+
+
+##Description
+
+The Test and Set-TargetResource functions of DSC Resource must have the same parameters.
+
+
+##How to Fix
+
+To fix a violation of this rule, please correct the mandatory parameters for Test and Set-TargetResource functions in DSC resource.
+
+
+##Example
+
+

RuleDocumentation/UseStandardDSCFunctionsInResource.md

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+#UseStandardDSCFunctionsInResource
+**Severity Level: Error**
+
+
+##Description
+
+DSC Resource must implement Get, Set and Test-TargetResource functions. DSC Class must implement Get, Set and Test functions.
+
+
+##How to Fix
+
+To fix a violation of this rule, please add the missing functions to the resouce.
+ 
+
+##Example
+