BAEL-1416 quick guide to kong (#3448)

* BAEL-1416 quick guide to kong

* refactor kong samples

spring-boot/src/main/java/com/baeldung/kong/QueryController.java

@@ -0,0 +1,32 @@
+package com.baeldung.kong;
+
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+/**
+ * @author aiet
+ */
+@RestController
+@RequestMapping("/stock")
+public class QueryController {
+
+    private static int REQUEST_COUNTER = 0;
+
+    @GetMapping("/reqcount")
+    public int getReqCount(){
+        return REQUEST_COUNTER;
+    }
+
+    @GetMapping("/{code}")
+    public String getStockPrice(@PathVariable String code){
+        REQUEST_COUNTER++;
+        if("BTC".equalsIgnoreCase(code))
+            return "10000";
+        else return "N/A";
+    }
+
+
+
+}