Add mruby topic

topics/mruby/index.md

@@ -0,0 +1,13 @@
+---
+created_by: Yukihiro Matsumoto
+display_name: mruby
+github_url: https://github.com/mruby
+logo: mruby.png
+related: language, mrubyc, microcontroller, ruby
+released: April 20, 2012
+short_description: mruby is a lightweight, embeddable implementation of Ruby.
+topic: mruby
+url: https://mruby.org/
+wikipedia_url: https://en.wikipedia.org/wiki/Mruby
+---
+mruby is the lightweight implementation of the Ruby language complying with part of the [ISO standard](https://www.iso.org/standard/59579.html). It can be linked and embedded within applications and it's designed to run in constrained environments, like microcontrollers.