Add Formatter.cs file to engine csproj

Author: Kapil Borle

Engine/ScriptAnalyzerEngine.csproj

@@ -71,6 +71,7 @@
     <Compile Include="Commands\InvokeScriptAnalyzerCommand.cs" />
     <Compile Include="EditableText.cs" />
     <Compile Include="Extensions.cs" />
+    <Compile Include="Formatter.cs" />
     <Compile Include="Generic\AvoidCmdletGeneric.cs" />
     <Compile Include="Generic\AvoidParameterGeneric.cs" />
     <Compile Include="Generic\ConfigurableRulePropertyAttribute.cs" />