docs: adds an interactive tut ref for killercoda env (#580)

docs/pages/crypto-websockets-interactive.md

@@ -0,0 +1,17 @@
+---
+title: 'Crypto Websockets - Interactive (Alpha)'
+description: Interactive version of the original Crypto Websockets tutorial.
+weight: 180
+---
+
+>tl;dr
+Please try out [this](https://killercoda.com/asyncapi-glee/scenario/crypto-websockets) interactive tutorial and let us know what you think, as we plan to have all the docs written this way.<!--more-->
+
+We created an interactive tutorial using [KillerCoda](https://killercoda.com). It is an interactive version of the [Crypto Websockets](https://github.com/asyncapi/glee/tree/master/examples/crypto-websockets) tutorial that will always work for you no matter what operating system you have.
+Please become our alpha testers of the tutorial:
+
+1. Go through the tutorial [here](https://killercoda.com/asyncapi-glee/scenario/crypto-websockets)
+2. Let us know what you think using the channel that works for you the best:
+   - [Slack](https://www.asyncapi.com/slack-invite/)
+   - [Twitter](https://twitter.com/AsyncAPISpec)
+   - [GitHub Issue](https://github.com/asyncapi/glee/issues/)