Add more rule documentations

Author: yutingc

RuleDocumentation/AvoidInvokingEmptyMembers.md

@@ -0,0 +1,22 @@
+#AvoidInvokingEmptyMembers
+**Severity Level: Warning**
+
+
+##Description
+
+Invoking non-constant members would cause potential bugs. Please double check the syntax to make sure members invoked are non-constant.
+
+
+##How to Fix
+
+To fix a violation of this rule, please provide requested members for given types or classes.
+
+##Example
+
+Wrong：    
+
+    "abc".('len'+'gth')
+
+Correct:    
+
+    "abc".('length')

RuleDocumentation/AvoidReservedCharInCmdlet.md

@@ -0,0 +1,25 @@
+#AvoidReservedCharInCmdlet
+**Severity Level: Error**
+
+
+##Description
+
+You cannot use following reserved characters in a function name. These characters usually cause a parsing error. Otherwise they will generally cause runtime errors.
+#,(){}[]&/\\$^;:\"'<>|?@`*%+=~
+
+
+##How to Fix
+
+To fix a violation of this rule, please remove reserved characters from your advanced function name.
+
+##Example
+
+Wrong： 
+
+function test[1]
+{...}
+
+Correct:
+
+function test
+{...}

RuleDocumentation/AvoidReservedParams.md

@@ -0,0 +1,31 @@
+#AvoidReservedParams
+**Severity Level: Error**
+
+
+##Description
+
+You cannot use reserved common parameters in an advanced function. If these parameters are defined by the user, an error generally occurs.
+
+##How to Fix
+
+To fix a violation of this rule, please change the name of your parameter.
+
+##Example
+
+Wrong： 
+
+function test
+{
+
+	[CmdletBinding]
+	Param($ErrorVariable, $b)
+}
+
+Correct:
+
+function test
+{
+
+	[CmdletBinding]
+	Param($err, $b)
+}

RuleDocumentation/AvoidUsingPositionalParameters

@@ -0,0 +1,19 @@
+#AvoidUsingPositionalParameters 
+**Severity Level: Info**
+
+##Description
+
+To fix a violation of this rule, please use named parameters instead of positional parameters when calling a command.
+
+##How to Fix
+
+To fix a violation of this rule, please use named parameters instead of positional parameters when calling a command.
+
+##Example
+Wrong:
+
+	Get-ChildItem *.txt
+
+Correct:
+
+	Get-Content -Path *.txt