feat: scaffold solution with NATS.Server library, host, and test projects

src/NATS.Server.Host/NATS.Server.Host.csproj

@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\NATS.Server\NATS.Server.csproj" />
+  </ItemGroup>
+
+</Project>

src/NATS.Server.Host/Program.cs

@@ -0,0 +1,2 @@
+// See https://aka.ms/new-console-template for more information
+Console.WriteLine("Hello, World!");