add server example

Author: tjk

packages/sdk/examples/server/Makefile

@@ -0,0 +1,2 @@
+default:
+	@node index.mjs

packages/sdk/examples/server/index.mjs

@@ -0,0 +1,10 @@
+import { createBackendClient } from "../../dist/server/server/index.js";
+
+const client = createBackendClient({
+  environment: "development",
+  credentials: {
+    clientId: "not-empty",
+    clientSecret: "not-empty",
+  },
+});
+console.log("sdk version: " + client.version);