Added constructors to Goldfish and Render

They really don't do anything yet.

src/Goldfish.java

@@ -1,2 +1,14 @@
 public class Goldfish {
+
+    private Grid _grid;
+    private Render _render;
+
+    public Goldfish () {
+        _render = new Render(640, 480);
+        _grid = new Grid(640, 480);
+    }
+
+    public static void main (String[] args) {
+        Goldfish g = new Goldfish();
+    }
 }

src/Render.java

@@ -1,2 +1,9 @@
 public class Render {
+    public Render (int width, int height) {
+    }
+
+    public Render () {
+        this(100,100);
+    }
+
 }