Add batch file for easier launching of VS

Following along with WinForms existing helper for this purpose.

start-vs.cmd

@@ -0,0 +1,44 @@
+@echo off
+setlocal enabledelayedexpansion
+
+:: This command launches a Visual Studio solution with environment variables required to use a local version of the .NET Core SDK.
+
+:: This tells .NET Core to use the same dotnet.exe that build scripts use
+set DOTNET_ROOT=%~dp0.dotnet
+set DOTNET_ROOT(x86)=%~dp0.dotnet\x86
+
+:: This tells .NET Core not to go looking for .NET Core in other places
+set DOTNET_MULTILEVEL_LOOKUP=0
+
+:: Put our local dotnet.exe on PATH first so Visual Studio knows which one to use
+set PATH=%DOTNET_ROOT%;%PATH%
+
+call restore.cmd
+
+if not exist "%DOTNET_ROOT%\dotnet.exe" (
+    echo [ERROR] .NET Core has not yet been installed. Run `%~dp0restore.cmd` to install tools
+    exit /b 1
+)
+
+:: These tasks aren't running successfully when launching VS, skipping when launching via this batch file
+set RunNetFrameworkApiCompat=false
+set RunRefApiCompat=false
+
+:: Prefer the VS in the developer command prompt if we're in one, followed by whatever shows up in the current search path.
+set "DEVENV=%DevEnvDir%devenv.exe"
+
+if exist "%DEVENV%" (
+    :: Fully qualified works
+    set "COMMAND=start "" /B "%ComSpec%" /S /C ""%DEVENV%" "%~dp0Microsoft.Dotnet.Wpf.sln"""
+) else (
+    where devenv.exe /Q
+    if !errorlevel! equ 0 (
+        :: On the PATH, use that.
+        set "COMMAND=start "" /B "%ComSpec%" /S /C "devenv.exe "%~dp0Microsoft.Dotnet.Wpf.sln"""
+    ) else (
+        :: Can't find devenv.exe, let file associations take care of it
+        set "COMMAND=start /B .\Microsoft.Dotnet.Wpf.sln"
+    )
+)
+
+%COMMAND%