add sample files.

01-01-scenegraph-sample/main.js

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+const { Rectangle, Color } = require('scenegraph');
+
+function main(selection, documentRoot) {
+    // Go to Plugins > Development > Developer Console to see this log output
+    console.log('No dialog is running!');
+
+    // Insert a red square at (0, 0) in the current artboard or group/container
+    const shape = new Rectangle();
+    shape.width = 100;
+    shape.height = 100;
+    shape.fill = new Color('#f00');
+    selection.insertionParent.addChild(shape);
+}
+
+module.exports = {
+    commands: {
+        menuCommand: main,
+    },
+};

01-01-scenegraph-sample/manifest.json

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+{
+  "name": "Red square",
+  "id": "abcd0123",
+  "version": "1.0.0",
+  "description": "Insert a square",
+  "icons": [
+    {
+      "width": 96,
+      "height": 96,
+      "path": "images/icon.png"
+    }
+  ],
+  "host": {
+    "app": "XD",
+    "minVersion": "13.0.0"
+  },
+  "uiEntryPoints": [
+    {
+      "type": "menu",
+      "label": {
+        "default": "Insert a square",
+        "en": "Insert a square",
+        "ja": "正方形を挿入する"
+      },
+      "commandId": "menuCommand"
+    }
+  ]
+}

01-02-scenegraph-sample-webpack/.eslintignore

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+build/
+.git/
+node_modules/
+doc/

01-02-scenegraph-sample-webpack/.eslintrc

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+{
+	"extends": [
+		"airbnb"
+	],
+	"plugins": [],
+	"parserOptions": {},
+	"env": {
+		"browser": true
+	},
+	"globals": {
+		"scenegraph": true
+	},
+	"rules": {
+		"indent": ["error", 4],
+		"no-unused-vars": "warn",
+		"no-console": "off",
+		"import/no-unresolved": ["warn", { "ignore": ["uxp", "secenegraph", "commands", "clipboard"] }],
+		"no-param-reassign": ["error", { "props": true, "ignorePropertyModificationsFor": ["selection"] }]
+	}
+}

01-02-scenegraph-sample-webpack/.gitignore

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+node_modules
+build
+build.xdx

01-02-scenegraph-sample-webpack/README.md

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+# Red square
+
+## Setup
+
+```bash
+npm install
+```
+
+## Live-loading plugin for `Develop` folder 
+
+Deploy the plugin and monitor updates of files.
+
+```bash
+npm start
+```
+
+## Deploy plugin to the `Develop` Folder
+
+```bash
+npm deploy
+```
+
+## Usage 
+
+#### 1. Reload plugins: 
+`Plugins` > `Development` > `Reload Plugins` or press `shift + command(ctrl) + R` keys.
+#### 2. Run the plugin: 
+`Plugins` > `Insert a square`