Add readme

Author: Jaroslaw

README.MD

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+# Next.js + Three.js load GLTF models
+
+\_\_
+
+Example of how to upload GLTF models in Next.js application. For article on Medium.
+
+## How to run
+
+```sh
+$ npm run watch
+
+```
+
+to start typescript watcher
+
+```sh
+$ npm run dev
+```
+
+to start devlopment server
+
+the app will run on http://localhost:3000/