Readme additions and reformatting (powertab#452)

* added table of contents

testing readme change

readme additions - table of contents, about us, reformatting

* Capitalization per comments on pr

README.md

@@ -1,25 +1,69 @@
-# Power Tab Editor
+<h1 align="center">
+  <b>
+    Power Tab Editor
+  </b>
+</h1>
 
-[![Build Status](https://github.com/powertab/powertabeditor/workflows/Build/badge.svg)](https://github.com/powertab/powertabeditor/actions)
+<p align="center"> Guitar tablature viewer and editor </p>
+<p align="center"><a href="https://powertab.github.io/"><b>Visit our website</b></a></p>
 
-[![Translation status](https://hosted.weblate.org/widgets/powertabeditor/-/powertabeditor/287x66-white.png)](https://hosted.weblate.org/engage/powertabeditor/)
+<div align="center">
 
-[![Get it from the Snap Store](https://snapcraft.io/static/images/badges/en/snap-store-black.svg)](https://snapcraft.io/powertabeditor)
-<a href='https://flathub.org/apps/details/com.github.powertab.powertabeditor'><img width='185' height='58' alt='Download on Flathub' src='https://flathub.org/assets/badges/flathub-badge-en.png'/></a>
+  [![Build Status](https://github.com/powertab/powertabeditor/workflows/Build/badge.svg)](https://github.com/powertab/powertabeditor/actions)
 
-### Users
+  [![Translation status](https://hosted.weblate.org/widgets/powertabeditor/-/powertabeditor/287x66-white.png)](https://hosted.weblate.org/engage/powertabeditor/)
+
+  [![Get it from the Snap Store](https://snapcraft.io/static/images/badges/en/snap-store-black.svg)](https://snapcraft.io/powertabeditor)
+  <a href='https://flathub.org/apps/details/com.github.powertab.powertabeditor'><img width='185' height='58' alt='Download on Flathub' src='https://flathub.org/assets/badges/flathub-badge-en.png'/></a>
+</div>
+
+
+## Table of Contents
+
+  - [About](#about-power-tab-editor)
+    - [Key Features](#key-features)
+    - [Supported File Types](#supported-file-types)
+  - [Users](#users)
+  - [Developers](#developers)
+    - [Dependencies](#dependencies)
+    - [Building](#building)
+      - [Windows](#windows)
+      - [Linux](#linux)
+      - [OS X](#os-x)
+
+
+## About Power Tab Editor
+Power Tab Editor 2.0 - A powerful cross platform guitar tablature viewer and editor inspired by the ceased development and missing source code from the original [Power Tab Editor](http://www.power-tab.net/guitar.php). This project is open-source and written from scratch so that your favorite tabbing platform can continuously grow with your needs.
+
+### Key Features
+- Cross platform - Windows, Mac, & Linux
+- Tabbed layout for opening multiple files at the same time
+- Mixer interface for adjusting volumes during playback
+- Complete customization of keyboard shortcuts
+- Importing of Guitar Pro tabs
+
+### Supported File Types
+- .pt2
+- .ptb
+- .gp3, .gp4, .gp5
+- .gpx
+- .gp
+
+## Users
 * New user? Read the [intro page](https://github.com/powertab/powertabeditor/wiki/Power-Tab-Editor-2.0,-Here-at-last!) to learn more about the project!
-* You can get the latest stable releases from our [downloads page](https://github.com/powertab/powertabeditor/releases). The latest development releases can be downloaded from the [actions page](https://github.com/powertab/powertabeditor/actions) (requires a GitHub login to download).
+* Download:
+  - Latest stable releases [ here ](https://github.com/powertab/powertabeditor/releases)
+  - Latest development releases [ here ](https://github.com/powertab/powertabeditor/actions) (requires a GitHub login to download)
 * You can report bugs or suggest features on our [issue tracker](https://github.com/powertab/powertabeditor/issues), or discuss ideas on the [discussions forum](https://github.com/powertab/powertabeditor/discussions)
 * You can [translate](https://hosted.weblate.org/engage/powertabeditor/) the project into your language.
 * Join the [Discord community](https://discord.gg/mpXfquuzxe)
 
-### Developers
+## Developers
 * Development help is very welcome! If you're interested in contributing, the issue tracker has a list of [good first issues](https://github.com/powertab/powertabeditor/issues?q=is%3Aissue+is%3Aopen+label%3A%22good+first+issue%22) that are easier to dive into!
 * Feel free to ask development-related questions on the [discussions page](https://github.com/powertab/powertabeditor/discussions) or on [Discord](https://discord.gg/mpXfquuzxe)
 * See below for instructions on how to compile and run the project:
 
-#### Dependencies:
+### Dependencies:
 * [CMake](http://www.cmake.org/) >= 3.12
 * [Boost](http://www.boost.org/) >= 1.65
   * algorithm
@@ -42,12 +86,13 @@
 * (Linux only) - MIDI sequencer (e.g. `timidity-daemon`)
 * A compiler with C++17 support.
 
+### Building:
 #### Windows:
 * Install Git - see https://help.github.com/articles/set-up-git
 * Install [vcpkg](https://github.com/microsoft/vcpkg) and run `vcpkg install --triplet x64-windows boost-algorithm boost-date-time boost-endian boost-functional boost-iostreams boost-range boost-rational boost-signals2 boost-stacktrace doctest minizip nlohmann-json pugixml` to install dependencies.
 * Install Qt by running `vcpkg install --triplet x64-windows qt5-base qt5-tools` (this may take a while), or install a binary release from the Qt website or https://github.com/miurahr/aqtinstall.
 * Open the project folder in Visual Studio and build.
-  * If running CMake manually, set `CMAKE_TOOLCHAIN_FILE` to `[vcpkg root]\scripts\buildsystems\vcpkg.cmake`).
+  * If running CMake manually, set `CMAKE_TOOLCHAIN_FILE` to `[vcpkg root]\scripts\buildsystems\vcpkg.cmake`
 
 #### Linux:
 * These instructions assume a recent Ubuntu/Debian-based system, but the package names should be similar for other package managers.