feat: Adds view controller test files, need to implement snapshot tests, and add test target.

Sources/ViewController/Live.swift

@@ -145,7 +145,7 @@ extension ViewController: DependencyKey {
       case let .psychrometrics(route):
         switch route {
         case .index:
-          return request.respond(PsychrometricsForm(response: .mock))
+          return request.respond(PsychrometricsForm(response: nil))
         case let .submit(request):
           let response = try await request.respond(logger: logger)
           return PsychrometricsResponse(response: response)