Merge pull request #14 from jbtule/main

Add .netstd2.0, add overload to allow sequence

Author: JordanMarr

src/FSharp.SystemCommandLine/CommandBuilders.fs

@@ -125,6 +125,14 @@ type BaseCommandBuilder<'A, 'B, 'C, 'D, 'E, 'F, 'G, 'H, 'Output>() =
     member this.Add(spec: CommandSpec<'Inputs, 'Output>, extraInput: HandlerInput<'Value>) =
         { spec with ExtraInputs = spec.ExtraInputs @ [ extraInput ] }
 
+    [<CustomOperation("add")>]
+    member this.Add(spec: CommandSpec<'Inputs, 'Output>, extraInput: HandlerInput seq) =
+        { spec with ExtraInputs = spec.ExtraInputs @ (extraInput |> List.ofSeq) }
+
+    [<CustomOperation("add")>]
+    member this.Add(spec: CommandSpec<'Inputs, 'Output>, extraInput: HandlerInput<'Value> seq) =
+        { spec with ExtraInputs = spec.ExtraInputs @ (extraInput |> Seq.cast |> List.ofSeq) }
+
     /// Sets general properties on the command.
     member this.SetGeneralProperties (spec: CommandSpec<'T, 'U>) (cmd: Command) = 
         cmd.Description <- spec.Description

src/FSharp.SystemCommandLine/FSharp.SystemCommandLine.fsproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFrameworks>netstandard2.0;net6.0</TargetFrameworks>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
 	<Version>0.15.0-beta4</Version>
 	<Description>F# computation expressions for working with the System.CommandLine API.</Description>