feat: cross platform projects.

demo/Ursa.Demo.Browser/AppBundle/main.js

@@ -0,0 +1,13 @@
+import { dotnet } from './dotnet.js'
+
+const is_browser = typeof window != "undefined";
+if (!is_browser) throw new Error(`Expected to be running in a browser`);
+
+const dotnetRuntime = await dotnet
+    .withDiagnosticTracing(false)
+    .withApplicationArgumentsFromQuery()
+    .create();
+
+const config = dotnetRuntime.getConfig();
+
+await dotnetRuntime.runMainAndExit(config.mainAssemblyName, [window.location.search]);