adds ToC to readme

Author: jacoscaz

README.md

@@ -6,6 +6,28 @@ them to standard output in the format of a Markdown table, CSV or JSON.
 Supports sorting and filtering based on metadata encoded in tags, inline and/or
 as YAML frontmatter.
 
+## Table of Contents
+
+- [taskparser](#taskparser)
+  - [Table of Contents](#table-of-contents)
+  - [Introduction](#introduction)
+  - [Example](#example)
+  - [Install](#install)
+  - [Usage](#usage)
+  - [Tags](#tags)
+    - [Choosing which tags to show](#choosing-which-tags-to-show)
+    - [Autogenerated tags](#autogenerated-tags)
+    - [Inline tags](#inline-tags)
+    - [Frontmatter tags](#frontmatter-tags)
+    - [Metadata file tags](#metadata-file-tags)
+    - [Heading tags](#heading-tags)
+    - [Filtering by tag](#filtering-by-tag)
+    - [Filtering by checked state](#filtering-by-checked-state)
+    - [Sorting by tag](#sorting-by-tag)
+  - [Worklogs](#worklogs)
+  - [License](#license)
+  - [Dependencies](#dependencies)
+
 ## Introduction
 
 See the [post on the rationale behind taskparser on my blog][intro].