feat: register service.

examples/register.ts

@@ -0,0 +1,19 @@
+import { AppConfig, ServiceRegister } from "../src";
+
+const config: AppConfig = {
+  etcd: {
+    hosts: "http://rpi:2379",
+  },
+};
+
+const register = new ServiceRegister(config);
+
+register
+  .register("example.configuration.fennec", "https://ivanli.cc")
+  .then(() => {
+    console.log("registered!");
+  })
+  .catch((error) => {
+    console.warn("failed!");
+    console.error(error);
+  });