feat(demo-consul): add consul demo module

demo-consul/src/main/java/com/helltractor/demo/ConsulApplication.java

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+package com.helltractor.demo;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@SpringBootApplication
+@RestController
+public class ConsulApplication {
+
+    @GetMapping("/")
+    public String home() {
+        return "Hello World!";
+    }
+
+    public static void main(String[] args) {
+        SpringApplication.run(ConsulApplication.class, args);
+    }
+
+}

demo-consul/src/main/resources/application.yml

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+server:
+  port: 8080
+
+spring:
+  application:
+    name: demo-consul
+  cloud:
+    consul:
+      discovery:
+        register: true
+        hostname: localhost
+        port: 8500