Add powershell script for generating schema tables

Author: glopesdev

build.ps1

@@ -0,0 +1,6 @@
+$files = Get-ChildItem .\src\device.*\device.yml
+foreach ($file in $files)
+{
+    Write-Output "Generating schema tables for $file..."
+    dotnet run --project .\src\harp.schemaprocessor $file .\apispec
+}