add CHANGELOG

CONTRIBUTING.md

@@ -0,0 +1,19 @@
+This project uses `parcel` as a development and packaging tool, so there are few overall configuration options
+
+## 1. Install dependencies
+
+```base
+npm install && npm run bootstrap
+```
+
+## 2. Develop the project and open the demo page
+
+```base
+npm run dev
+```
+
+## 3. Package the project
+
+```base
+npm run build
+```