Added Gradle to Groovy project.

Groovy/src/main/groovy/com/gildedrose/GildedRose.groovy

@@ -0,0 +1,62 @@
+package com.gildedrose
+
+class GildedRose {
+    Item[] items
+
+    GildedRose(Item[] items) {
+        this.items = items
+    }
+
+    void updateQuality() {
+        for (int i = 0; i < items.length; i++) {
+            if (!items[i].name.equals("Aged Brie")
+                    && !items[i].name.equals("Backstage passes to a TAFKAL80ETC concert")) {
+                if (items[i].quality > 0) {
+                    if (!items[i].name.equals("Sulfuras, Hand of Ragnaros")) {
+                        items[i].quality = items[i].quality - 1
+                    }
+                }
+            } else {
+                if (items[i].quality < 50) {
+                    items[i].quality = items[i].quality + 1
+
+                    if (items[i].name.equals("Backstage passes to a TAFKAL80ETC concert")) {
+                        if (items[i].sellIn < 11) {
+                            if (items[i].quality < 50) {
+                                items[i].quality = items[i].quality + 1
+                            }
+                        }
+
+                        if (items[i].sellIn < 6) {
+                            if (items[i].quality < 50) {
+                                items[i].quality = items[i].quality + 1
+                            }
+                        }
+                    }
+                }
+            }
+
+            if (!items[i].name.equals("Sulfuras, Hand of Ragnaros")) {
+                items[i].sellIn = items[i].sellIn - 1
+            }
+
+            if (items[i].sellIn < 0) {
+                if (!items[i].name.equals("Aged Brie")) {
+                    if (!items[i].name.equals("Backstage passes to a TAFKAL80ETC concert")) {
+                        if (items[i].quality > 0) {
+                            if (!items[i].name.equals("Sulfuras, Hand of Ragnaros")) {
+                                items[i].quality = items[i].quality - 1
+                            }
+                        }
+                    } else {
+                        items[i].quality = items[i].quality - items[i].quality
+                    }
+                } else {
+                    if (items[i].quality < 50) {
+                        items[i].quality = items[i].quality + 1
+                    }
+                }
+            }
+        }
+    }
+}

Groovy/src/main/groovy/com/gildedrose/Item.groovy

@@ -0,0 +1,21 @@
+package com.gildedrose
+
+class Item {
+
+    String name
+
+    int sellIn
+
+    int quality
+
+    Item(String name, int sellIn, int quality) {
+        this.name = name
+        this.sellIn = sellIn
+        this.quality = quality
+    }
+
+   @Override
+   String toString() {
+        return this.name + ", " + this.sellIn + ", " + this.quality
+    }
+}