Adds doc for SpotLight - WhitestormJS#189

Former-commit-id: 8b665b2

src/components/lights/SpotLight.js

@@ -1,6 +1,26 @@
 import {SpotLight as SpotLightNative} from 'three';
 import {LightComponent} from '../../core/LightComponent';
 
+/**
+ * @class SpotLight
+ * @category components/lights
+ * @description SpotLight creates spot light that can cast shadow in one direction. <br/><br/>
+ * It has the same parameters as AmbientLight in light, but it also supports pos and target. <br/><br/>
+ * SpotLight affects meshes with lambert and phong material.
+ * @param {Object} [params={light: {color: 0xffffff, intensity: 1, distance: 100, angle: Math.PI / 3, exponent: 0, decay: 1}}] - The params.
+ * @extends LightComponent
+ * @memberof module:components/lights
+ * @example <caption>Creating a SpotLight that falls down from vec3(10, 20, 10) to vec3(0, 0, 0)</caption>
+ * new LightComponent({
+ *   light: {
+ *     color: 0x00ff00,
+ *     intensity: 3,
+ *     distance: 1000
+ *   },
+ *
+ *   position: [10, 20, 10]
+ * }).addTo(app);
+ */
 class SpotLight extends LightComponent {
   static defaults = {
     ...LightComponent.defaults,