doc: Recorded screencast and updated of readme

... to be more attractive. Inspired by https://github.com/faressoft/terminalizer/blob/master/README.md

README.md

@@ -6,14 +6,17 @@
 [![All Contributors](https://img.shields.io/badge/all_contributors-13-orange.svg?style=flat-square)](#contributors-)
 <!-- ALL-CONTRIBUTORS-BADGE:END -->
 
-- [OSXPhotos](#osxphotos)
+> OSXPhotos provides the ability to interact with and query Apple's Photos.app library on macOS. You can query the Photos library database — for example, file name, file path, and metadata such as keywords/tags, persons/faces, albums, etc. You can also easily export both the original and edited photos.
-  * [What is osxphotos?](#what-is-osxphotos)
+
-  * [Supported operating systems](#supported-operating-systems)
+<p align="center"><img src="docs/screencast/demo.gif?raw=true" width="713" height="430"/></p>
-  * [Installation instructions](#installation-instructions)
+
-  * [Command Line Usage](#command-line-usage)
+# Table of Contents
+* [Supported operating systems](#supported-operating-systems)
+* [Installation instructions](#installation-instructions)
+* [Command Line Usage](#command-line-usage)
  + [Command line examples](#command-line-examples)
  + [Command line reference: export](#command-line-reference-export)
-  * [Package Interface](#package-interface)
+* [Package Interface](#package-interface)
  + [PhotosDB](#photosdb)
  + [PhotoInfo](#photoinfo)
  + [ExifInfo](#exifinfo)
@@ -30,18 +33,16 @@
  + [Raw Photos](#raw-photos)
  + [Template Substitutions](#template-substitutions)
  + [Utility Functions](#utility-functions)
-  * [Examples](#examples)
+* [Examples](#examples)
-  * [Related Projects](#related-projects)
+* [Related Projects](#related-projects)
-  * [Contributing](#contributing)
+* [Contributing](#contributing)
-  * [Known Bugs](#known-bugs)
+* [Known Bugs](#known-bugs)
-  * [Implementation Notes](#implementation-notes)
+* [Implementation Notes](#implementation-notes)
-  * [Dependencies](#dependencies)
+* [Dependencies](#dependencies)
-  * [Acknowledgements](#acknowledgements)
+* [Acknowledgements](#acknowledgements)
 
 
-## What is osxphotos?
   
-OSXPhotos provides the ability to interact with and query Apple's Photos.app library on macOS. You can query the Photos library database -- for example, file name, file path, and metadata such as keywords/tags, persons/faces, albums, etc. You can also easily export both the original and edited photos.
 
 ## Supported operating systems