docs(external resources): First version of external resources

docs_app/content/external-resources.md

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+# External Resources
+
+This is a collection of resources that can be found to help with the learning process of RxJS. The list is ever growing which will make it a place for you to come to for finding helpful information.
+
+**Note**: RxJS maintainers are not responsible for any of the following content that is not part of the official rxjs documentation site. Please adhere to the terms and copyrights of the sites and links listed.
+
+---
+
+## Blogs
+
+### 2018
+
+* Thinking reactive with the SIP principle | [StrongBrew](https://blog.strongbrew.io/the-sip-principle/) | June 30, 2018
+* Angular 6: Upgrading API calls to RxJS 6 | [Metal Toad](https://www.metaltoad.com/blog/angular-6-upgrading-api-calls-rxjs-6) | May 23, 2018
+
+---
+
+## Playgrounds
+
+* Rx Visualizer | [https://rxviz.com/](https://rxviz.com/)
+
+---
+
+## Reference
+
+* Learn RxJS | [https://www.learnrxjs.io/](https://www.learnrxjs.io)
+* [http://reactive.how](http://reactive.how)
+
+---
+
+## Tutorials
+
+### 2018
+
+* A Better Way to Learn RxJS & Observables | [thinkster](https://thinkster.io/tutorials/learn-rxjs-observables) | August 18, 2018
+
+---
+
+## Videos
+
+### 2018
+
+* RxJS 6 Changes - Overview |  [academind.com](https://www.academind.com/learn/javascript/rxjs-6-what-changed/) | Last Updated: May 3, 2018
+* Introducing RxJS! | [ng-conf 2018](https://www.youtube.com/watch?v=JCXZhe6KsxQ) | April 20, 2018
+* Learn RxJS in 60 Minutes for Beginners | [YouTube](https://www.youtube.com/watch?v=PhggNGsSQyg) | March 30, 2018

docs_app/content/navigation.json

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 			]
 		},
 		{
+      "url": "resources",
+      "title": "External Resources",
+      "tooltip": "External Resources"
+		},
+		{
 			"url": "code-of-conduct",
 			"title": "Code of Conduct",
 			"tooltip": "Code of Conduct"