Add Medium post to intro
Spoke to who agreed it makes sense to add the "Grin Transactions Explained, Step-by-Step" Medium post to intro.md
Open for suggestions on a better location.
@@ -23,6 +23,8 @@ The main goal and characteristics of the Grin project are:
* Design simplicity that makes it easy to audit and maintain over time.
* Community driven, encouraging mining decentralization.
+A detailed post on the step-by-step of how Grin transactions work (with graphics) can be found [in this Medium post](https://medium.com/@brandonarvanaghi/grin-transactions-explained-step-by-step-fdceb905a853).
+
## Tongue Tying for Everyone
This document is targeted at readers with a good
