add CWLParameterReference type

Author: HLWeil

src/CWL/ARCtrl.CWL.fsproj

@@ -13,6 +13,7 @@
     <Compile Include="Outputs.fs" /> 
     <Compile Include="Inputs.fs" /> 
     <Compile Include="WorkflowSteps.fs" /> 
+    <Compile Include="ParameterReference.fs" /> 
     <Compile Include="ToolDescription.fs" /> 
     <Compile Include="WorkflowDescription.fs" /> 
     <Compile Include="CWLProcessingUnit.fs" /> 

src/CWL/ParameterReference.fs

@@ -0,0 +1,12 @@
+namespace ARCtrl.CWL
+
+open Fable.Core
+open System
+
+[<AttachMembers>]
+type CWLParameterReference = {
+    Key: string 
+    Values: string ResizeArray
+    Type: string option
+}
+