Adjust code to airbnb style guide, including eslint rules and prettier configuration for code base

plejd/SceneStep.js

@@ -0,0 +1,10 @@
+class SceneStep {
+  constructor(step) {
+    this.sceneId = step.sceneId;
+    this.deviceId = step.deviceId;
+    this.state = step.state === 'On' ? 1 : 0;
+    this.brightness = step.value;
+  }
+}
+
+module.exports = SceneStep;