Added jsdocs

Author: photonstorm

src/textures/FilterMode.js

@@ -1,6 +1,25 @@
+/**
+ * @namespace Phaser.Textures.FilterMode
+ */
+
 var CONST = {
 
+    /**
+     * CSV Map Type
+     * 
+     * @name Phaser.Textures.FilterMode.LINEAR
+     * @type {number}
+     * @since 3.0.0
+     */
     LINEAR: 0,
+
+    /**
+     * CSV Map Type
+     * 
+     * @name Phaser.Textures.FilterMode.NEAREST
+     * @type {number}
+     * @since 3.0.0
+     */
     NEAREST: 1
 
 };