Add first device schema and corresponding interface

.editorconfig

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+# To learn more about .editorconfig see https://aka.ms/editorconfigdocs
+###############################
+# Core EditorConfig Options   #
+###############################
+# All files
+[*]
+indent_style = space
+
+# XML project files
+[*.{csproj,vcxproj,vcxproj.filters,proj,projitems,shproj,bonsai}]
+indent_size = 2
+
+# XML config files
+[*.{props,targets,ruleset,config,nuspec,resx,vsixmanifest,vsct}]
+indent_size = 2
+
+# Code files
+[*.{cs,csx}]
+indent_size = 4
+insert_final_newline = true
+charset = utf-8-bom
+###############################
+# .NET Coding Conventions     #
+###############################
+[*.{cs}]
+# Organize usings
+dotnet_sort_system_directives_first = true

.gitignore

@@ -1,3 +1,4 @@
+
 # Visual studio files
 .vs
 .suo

Firmware/.gitignore

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+# Visual studio files
+.vs
+.suo
+.nuget
+bin
+obj
+Debug
+packages
+*.componentinfo.xml

Generators/Generators.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <CopyLocalLockFileAssemblies>true</CopyLocalLockFileAssemblies>
+    <RootNamespace>Harp.RgbArray</RootNamespace>
+    <TargetFramework>net6.0</TargetFramework>
+    <LangVersion>latest</LangVersion>
+    <OutputPath>bin</OutputPath>
+  </PropertyGroup>
+  <PropertyGroup>
+    <DeviceMetadata>..\device.yml</DeviceMetadata>
+    <IOMetadata>..\ios.yml</IOMetadata>
+  </PropertyGroup>
+  <PropertyGroup>
+    <InterfacePath>..\Interface\Harp.RgbArray</InterfacePath>
+    <FirmwarePath>..\Firmware\Harp.RgbArray</FirmwarePath>
+  </PropertyGroup>
+  <ItemGroup>
+    <PackageReference Include="Harp.Generators" Version="0.1.0" GeneratePathProperty="true" />
+  </ItemGroup>
+  <Target Name="TextTransform" BeforeTargets="AfterBuild">
+    <PropertyGroup>
+      <InterfaceFlags>-p:MetadataPath=$(DeviceMetadata) -p:Namespace=$(RootNamespace) -P=$(TargetDir)</InterfaceFlags>
+      <FirmwareFlags>-p:RegisterMetadataPath=$(DeviceMetadata) -p:IOMetadataPath=$(IOMetadata) -P=$(TargetDir)</FirmwareFlags>
+    </PropertyGroup>
+    <Exec WorkingDirectory="$(ProjectDir)"
+          Condition="Exists($(DeviceMetadata)) And $([System.String]::new('%(Content.Link)').EndsWith('Device.tt'))"
+          Command="t4 %(Content.Identity) $(InterfaceFlags) -o=$(InterfacePath)\%(Content.Link)" />
+    <Exec WorkingDirectory="$(ProjectDir)"
+          Condition="Exists($(IOMetadata)) And '%(Content.Link)' == 'Firmware.tt'"
+          Command="t4 %(Content.Identity) $(FirmwareFlags) -o=$(FirmwarePath)\app_ios_and_regs.h" />
+  </Target>
+</Project>

Interface/Harp.RgbArray.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.3.32825.248
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9B2E00B8-401A-48DB-86FB-37B00C8FD508}") = "Harp.RgbArray", "Harp.RgbArray\Harp.RgbArray.csproj", "{EDDF0906-0230-4DD6-9350-7B0CB313D453}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{EDDF0906-0230-4DD6-9350-7B0CB313D453}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{EDDF0906-0230-4DD6-9350-7B0CB313D453}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{EDDF0906-0230-4DD6-9350-7B0CB313D453}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{EDDF0906-0230-4DD6-9350-7B0CB313D453}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {22F433E4-A2EC-44E6-8C2E-4D8D8897899A}
+	EndGlobalSection
+EndGlobal