Update Example.

README.md

@@ -28,3 +28,45 @@ self.view.arrangerAddSubview(button) {
 }
 self.view.endArrangeSubviews()
 ```
+### Example: Display MxN button matrix
+```
+self.view.beginArrangeSubviews()
+        
+var btns = [[UIButton]]()
+let lineCount = 10
+let columnCount = 10
+for lineId in 0..<lineCount {
+    var line = [UIButton]()
+    for columnId in 0..<columnCount {
+        let btn = UIButton()
+        btn.backgroundColor = .cyan
+        btn.setTitle("(\(lineId), \(columnId))", for: .normal)
+        line.append(btn)
+        self.view.arrangerAddSubview(btn) {
+            if columnId == 0 {
+                $0.left == self.view.left
+            }
+            if columnId == columnCount - 1 {
+                $0.right == self.view.right
+            }
+            if lineId == 0 {
+                $0.top == self.view.safeAreaLayoutGuide.topAnchor
+            }
+            if lineId == lineCount - 1 {
+                $0.bottom == self.view.bottomAnchor
+            }
+            if columnId > 0 {
+                $0.width == line[columnId - 1].width
+                $0.left == line[columnId - 1].right + 1
+            }
+            if lineId > 0 {
+                $0.height == btns[lineId - 1][columnId].height
+                $0.top == btns[lineId - 1][columnId].bottom + 1
+            }
+        }
+    }
+    btns.append(line)
+}
+
+self.view.endArrangeSubviews()
+```