Adding uuid for approach of queen-attack exercise

exercises/practice/queen-attack/.approaches/config.json

@@ -1,19 +1,18 @@
 {
-    "introduction": {
+  "introduction": {
+    "authors": [
+      "jagdish-15"
+    ]
+  },
+  "approaches": [
+    {
+      "uuid": "b2e474c8-b778-41e7-83c0-8e41cc84af9e",
+      "slug": "simple-comparison",
+      "title": "Simple Comparison Approach",
+      "blurb": "Use basic comparison checks to determine if queens can attack each other.",
       "authors": [
         "jagdish-15"
       ]
-    },
-    "approaches": [
-      {
-        "uuid": "",
-        "slug": "simple-comparison",
-        "title": "Simple Comparison Approach",
-        "blurb": "Use basic comparison checks to determine if queens can attack each other.",
-        "authors": [
-          "jagdish-15"
-        ]
-      }
-    ]
-  }
-
+    }
+  ]
+}

exercises/practice/queen-attack/.approaches/simple-comparison/snippet.txt

@@ -0,0 +1,5 @@
+boolean canQueensAttackOneAnother() {
+    int rowDifference = Math.abs(queen1.getRow() - queen2.getRow());
+    int columnDifference = Math.abs(queen1.getColumn() - queen2.getColumn());
+    return rowDifference == 0 || columnDifference == 0 || rowDifference == columnDifference;
+}