Add support for base (proxy) class (#29)

src/ProxyInterfaceSourceGenerator/Models/ClassSymbol.cs

@@ -0,0 +1,11 @@
+using Microsoft.CodeAnalysis;
+
+namespace ProxyInterfaceSourceGenerator.Models;
+
+internal record ClassSymbol(INamedTypeSymbol Symbol, List<INamedTypeSymbol> BaseTypes, List<INamedTypeSymbol> Interfaces)
+{
+    public override string ToString()
+    {
+        return Symbol.ToString();
+    }
+}