gitpod: deploy

Disclaimer: i'm not gitpod staff i just like their product

Proposing to integrate gitpod with this repository which is online IDE based on Theia which allows contributors to open an online environment without the need to fetch deps on their local system.

This service is free for open-source repositories.

Example of the runtime:
https://gitpod.io/#https://github.com/RXT067/cheatsheets/tree/gitpod

Signed-off-by: Jacob Hrbek <kreyren@rixotstudio.cz>

.gitpod.yml

@@ -0,0 +1,4 @@
+image: gitpod/workspace-full
+
+tasks:
+  - init: bundle install

CONTRIBUTING.md

@@ -1,5 +1,19 @@
 # Developer notes
 
+## Gitpod 
+This repository supports contribution using [gitpod](https://gitpod.io) which is online IDE using [Theia](https://github.com/eclipse-theia/theia).
+
+To open-up the environment simple natigate on https://gitpod.io/#https://github.com/rstacruz/cheatsheets
+
+Or using a button:<br>
+[![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/#https://github.com/rstacruz/cheatsheets)
+
+### Preview built website
+To preview the website you need to first build it then you can navigate to file that you are trying to contribute and preview directly.
+
+<img src='_docs/images/gitpod_preview_tut.png' width=828 height=459/>
+
+
 ## Starting a local instance
 
 This starts Jekyll and Webpack. This requires recent versions of [Node.js], [Yarn], [Ruby] and [Bundler] installed.

README.md

@@ -17,3 +17,5 @@
 ---
 
 See [CONTRIBUTING.md](CONTRIBUTING.md) for developer notes.
+
+[![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/#https://github.com/rstacruz/cheatsheets)