add springboot quick guide

backend/springboot/README.md

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+# Create Spring Boot Project
+
+* Browse [Spring Initialzr](https://start.spring.io/)
+* Option to select
+  * Gradle
+  * Java 8
+  * Dependencies
+    * Lombok
+    * Spring Web / REST Repositories
+* Download the generated project
+* Open with `IntelliJ IDEA`
+
+# Create REST endpoint
+
+* Create a java class
+* Annotation with `@RESTController`, `@GetMapping` etc
+
+```java
+package com.razer.starter.api.controller;
+
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.ResponseBody;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@Slf4j
+public class HomeController {
+
+    @GetMapping("/home1")
+    @ResponseBody
+    public String Home(){
+
+        // log instaciate from  @Slf4j annotation
+        log.info("home...");
+        return "Welcome Home";
+    }
+}
+```
+
+* Run the project
+
+```sh
+./gradlew bootRun
+```
+
+* Browse [localhost](http://localhost:8080/home1) to reach the endpoint
+
+```text
+home...
+```
+
+## Create IntelliJ Debug Configuration
+
+* `Run `> `Edit Configuration...`
+* Add 'bootRun' Task. Click 'Ok'
+* Now `Run...` or `Debug...` accordingly
+* Alternatively, goto `main` and right click on side bar to run / debug
+
+```java
+public class StarterApplication {
+	private static final Logger log = LoggerFactory.getLogger(StarterApplication.class);
+
+	public static void main(String[] args) {
+		SpringApplication.run(StarterApplication.class, args);
+	}
+}
+```
+
+
+