Adding approach link

Author: jagdish-15

exercises/practice/change/.approaches/config.json

@@ -2,6 +2,9 @@
   "introduction": {
     "authors": [
       "jagdish-15"
+    ],
+    "contributors": [
+      "kahgoh"
     ]
   },
   "approaches": [

exercises/practice/change/.approaches/introduction.md

@@ -56,6 +56,8 @@ class ChangeCalculator {
 }
 ```
 
+For a detailed look at the code and logic, see the full explanation in the [Recursive Approach][approach-recursive].
+
 ## Approach: Dynamic Programming - Top down
 
 ```java