add package.json and readme for node editor required for build

dist/preview release/nodeEditor/package.json

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+{
+  "author": {
+      "name": "David CATUHE"
+  },
+  "name": "babylonjs-node-editor",
+  "description": "The Babylon.js node material editor.",
+  "version": "4.1.0-alpha.0",
+  "repository": {
+      "type": "git",
+      "url": "https://github.com/BabylonJS/Babylon.js.git"
+  },
+  "license": "Apache-2.0",
+  "dependencies": {
+      "babylonjs": "4.1.0-alpha.0"
+  },
+  "engines": {
+      "node": "*"
+  }
+}

dist/preview release/nodeEditor/readme-es6.md

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+Node Editor

nodeEditor/README-ES6.md

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+Node Editor