Fixed Leo File and updated documentation

CONTRIBUTING.md

@@ -4,7 +4,11 @@ Thanks for trying out the development version of LeoInteg! :sunglasses: Contribu
 
 ## Introduction
 
-If you're new to vscode and want to try out Leo with this vscode extension, you might want to look at this [Getting Started](https://code.visualstudio.com/docs#vscode-in-action) page to get an overview.
+[Video tutorial of installation and startup](https://www.youtube.com/watch?v=rutt11xL54I):
+
+[![Installation and startup video](https://img.youtube.com/vi/rutt11xL54I/0.jpg)](https://www.youtube.com/watch?v=rutt11xL54I)
+
+If you're new to vscode and want to try out Leo with this vscode extension, you might want to look at this [Getting Started](https://code.visualstudio.com/docs#vscode-in-action) page to get an overview of vscode.
 
 Furthermore, if you've never ran a vscode extension in an **Extension Development Host**, here is a [short overview about running and modifying a simple extension](https://code.visualstudio.com/api/get-started/your-first-extension).
 

README.md

@@ -2,9 +2,9 @@
 
 ## Literate Programming with _Directed Acyclic Graphs_ ([dag](https://en.wikipedia.org/wiki/Directed_acyclic_graph))
 
-### Break your code down into sections structured as an outline, to derive or parse back your files
+### Break your code down into sections structured as an outline, to derive or parse back your files 
 
-> Leo is a fundamentally different way of using and organizing data, programs and scripts.
+> Leo is a fundamentally different way of using and organizing data, programs and scripts. [View Preview Video](https://www.youtube.com/watch?v=SYwlfdEukD4)
 
 See Leo, the Literate Editor with Outline, at [leoeditor.com](https://leoeditor.com/)
 or on [github](https://github.com/leo-editor/leo-editor), and vscode at [code.visualstudio.com](https://code.visualstudio.com/).
@@ -21,6 +21,10 @@ or on [github](https://github.com/leo-editor/leo-editor), and vscode at [code.vi
 
 ## Development version installation
 
+[Video tutorial of installation and startup](https://www.youtube.com/watch?v=rutt11xL54I):
+
+[![Installation and startup video](https://img.youtube.com/vi/rutt11xL54I/0.jpg)](https://www.youtube.com/watch?v=rutt11xL54I)
+
 In addition to the above requirements, **use Leo's 'devel' branch** (This is temporary until Leo's next release), make sure you have Node.js and Git installed, then clone the sources and run `npm install` in a terminal to install the remaining development dependencies.
 
 ![run extension](/resources/run-extension.png)