Add TOC

Author: hasufell

README.md

@@ -1,3 +1,30 @@
+Table of Contents
+=================
+
+* [Haskell for Visual Studio Code](#haskell-for-visual-studio-code)
+   * [Setup](#setup)
+   * [Features](#features)
+   * [Requirements](#requirements)
+   * [Configuration options](#configuration-options)
+      * [Path to server executable](#path-to-server-executable)
+         * [Security warning](#security-warning)
+      * [Set additional environment variables for the server](#set-additional-environment-variables-for-the-server)
+      * [Downloaded binaries](#downloaded-binaries)
+      * [Setting a specific toolchain](#setting-a-specific-toolchain)
+      * [Supported GHC versions](#supported-ghc-versions)
+   * [Using multi-root workspaces](#using-multi-root-workspaces)
+   * [Investigating and reporting problems](#investigating-and-reporting-problems)
+   * [FAQ](#faq)
+      * [Troubleshooting](#troubleshooting)
+         * [Check issues and tips in the haskell-language-server project](#check-issues-and-tips-in-the-haskell-language-server-project)
+         * [Restarting the language server](#restarting-the-language-server)
+         * [Failed to get project GHC version on darwin M1 with stack](#failed-to-get-project-ghc-version-on-darwin-m1-with-stack)
+         * [GHC ABIs don't match](#ghc-abis-dont-match)
+         * [Using an old configuration](#using-an-old-configuration)
+         * [Stack/Cabal/GHC can not be found](#stackcabalghc-can-not-be-found)
+   * [Contributing](#contributing)
+   * [Release Notes](#release-notes)
+
 # Haskell for Visual Studio Code
 
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