Add gitpod config

Author: lukashass

.gitpod.yml

@@ -0,0 +1,9 @@
+tasks:
+  - name: development server
+    init: make install
+    command: make dev
+
+vscode:
+  extensions:
+    - redhat.vscode-yaml
+    - DavidAnson.vscode-markdownlint

Gemfile

@@ -3,3 +3,4 @@ gem 'github-pages'
 gemspec
 gem 'jekyll-seo-tag'
 gem 'wdm', '>= 0.1.0' if Gem.win_platform?
+gem "webrick", "~> 1.7"

README.md

@@ -5,3 +5,5 @@
 
 If you've spotted an error or have additional information for a device click on **EDIT ON GITHUB** box to add. 
 If it's your first time refer to "[Editing Articles](https://tasmota.github.io/docs/Contributing/#editing-articles)" for a tutorial. 
+
+[![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/#https://github.com/blakadder/zigbee)