Issue #1: scaffold gateway solution and projects

src/MxGateway.Contracts/GatewayContractInfo.cs

@@ -0,0 +1,12 @@
+namespace MxGateway.Contracts;
+
+/// <summary>
+/// Exposes version metadata shared by gateway components before generated
+/// protobuf contracts are introduced.
+/// </summary>
+public static class GatewayContractInfo
+{
+    public const uint WorkerProtocolVersion = 1;
+
+    public const string DefaultBackendName = "mxaccess-worker";
+}

src/MxGateway.Contracts/MxGateway.Contracts.csproj

@@ -0,0 +1,7 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+  </PropertyGroup>
+
+</Project>