Added TreeMap chart

- Added tests

tests/LivewireTreeMapChartTest.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace Asantibanez\LivewireCharts\Tests;
+
+use Asantibanez\LivewireCharts\Charts\LivewireTreeMapChart;
+use Livewire\Livewire;
+use Livewire\Testing\TestableLivewire;
+
+class LivewireTreeMapChartTest extends TestCase
+{
+    private function buildComponent() : TestableLivewire
+    {
+        return Livewire::test(LivewireTreeMapChart::class);
+    }
+
+    /** @test */
+    public function can_build_component()
+    {
+        //Act
+        $component = $this->buildComponent();
+
+        //Assert
+        $this->assertNotNull($component);
+    }
+}