Add table of contents to the readme

README.md

 
 ## Examples
 
-Code samples and demos covering various usecases and test are present in the [examples](./examples/) folder. 
+Code samples and demos covering various usecases and test are present in the [examples](./examples/) folder.
 
 Try them: https://threepipe.org/examples/
 
 
 To make changes and run the example, click on the CodePen button on the top right of the source code.
 
+# Table of Contents
+
+- [ThreePipe](#threepipe)
+  - [Examples](#examples)
+  - [Table of Contents](#table-of-contents)
+  - [Getting Started](#getting-started)
+    - [HTML/JS Quickstart (CDN)](#htmljs-quickstart-cdn)
+    - [NPM/YARN Package](#npmyarn)
+      - [Installation](#installation)
+      - [Loading a 3D Model](#loading-a-3d-model)
+  - [License](#license)
+  - [Status](#status)
+  - [Documentation (API Reference)](#documentation)
+  - [WebGi](#webgi)
+  - [Contributing](#contributing)
+- [Features](#features)
+  - [File Formats](#file-formats)
+  - [Loading files](#loading-files)
+    - [3D models](#3d-models)
+    - [Materials](#materials)
+    - [Images/Textures](#imagestextures)
+    - [zip files](#zip-files)
+    - [txt, json files](#txt-json-files)
+    - [Data URLs](#data-urls)
+    - [Local files, File and Blob](#local-files-file-and-blob)
+    - [Background, Environment maps](#background-environment-maps)
+    - [SVG strings](#svg-strings)
+- [Plugins](#threepipe-plugins)
+  - [TonemapPlugin](#tonemapplugin) - Tonemapping Plugin for post-processing
+  - [DropzonePlugin](#dropzoneplugin) - Drag and drop local files to import and load
+  - [DepthBufferPlugin](#depthbufferplugin) - Depth Buffer Plugin for pre-rendering depth buffer
+  - [NormalBufferPlugin](#normalbufferplugin) - Normal Buffer Plugin for pre-rendering normal buffer
+  - [DepthNormalBufferPlugin](#depthnormalbufferplugin) - Depth and Normal Buffer Plugin for pre-rendering depth and normal buffers in a single pass
+  - [RenderTargetPreviewPlugin](#rendertargetpreviewplugin) - Render Target Preview Plugin for previewing render targets
+  - [Rhino3dmLoadPlugin](#rhino3dmloadplugin) - Rhino3dm Load Plugin for loading .3dm files
+  - [PLYLoadPlugin](#plyloadplugin) - PLY Load Plugin for loading .ply files
+  - [STLLoadPlugin](#stlloadplugin) - STL Load Plugin for loading .stl files
+  - [KTX2LoadPlugin](#ktx2loadplugin) - KTX2 Load Plugin for loading .ktx2 files
+  - [KTXLoadPlugin](#ktxloadplugin) - KTX Load Plugin for loading .ktx files
+- [Packages](#threepipe-packages)
+  - [@threepipe/plugin-tweakpane](#threepipeplugin-tweakpane) Tweakpane UI Plugin
+  - [@threepipe/plugin-tweakpane-editor](#threepipeplugin-tweakpane-editor) - Tweakpane Editor Plugin
 
 ## Getting Started
 
 ## Contributing
 Contributions to ThreePipe are welcome and encouraged! Feel free to open issues and pull requests on the GitHub repository.
 
+# Features
+
 ## File Formats
 
 ThreePipe Asset Manager supports the import of the following file formats out of the box:
 The `viewer.load()`, `viewer.assetManager.addAsset()`
 and `viewer.assetManager.addAssetSingle()` methods perform combination of `import` and `loadImported`.
 
-### 3d models.
+### 3D models
 
 The 3d models are added to `viewer.scene.modelRoot` on `viewer.load` unless some option is specified.