Add Sokoban tutorial update

content/posts/newsletter-009/index.md

@@ -147,6 +147,22 @@ _Discussions:
 
 ## Library & Tooling Updates
 
+### Rust Sokoban Tutorial
+
+![sokoban level](sokoban_level.gif)
+
+Rust Sokoban tutorial is an online book aimed at Rust gamedev beginners
+which walks through making a simple Sokoban game using ECS, ggez and specs.
+It tries to teach the basics of architecting in ECS and basic Rust concepts
+through a hands-on approach.
+[@oliviff] is currently looking for a few people
+to beta test the tutorial before it goes live,
+if you've got a spare couple of hours and you'd like to contribute,
+send her a [DM][oliviff-dm].
+
+[@oliviff]: https://twitter.com/oliviff
+[oliviff-dm]: https://twitter.com/messages/compose?recipient_id=118804845
+
 ### `gfx-rs` and `wgpu` News
 
 ![hectic screenshot: graveyard and vampires](hectic.png)
@@ -342,6 +358,7 @@ or [join the next meeting][join].
 
 <!-- Links to "good first issue"-labels or direct links to specific tasks -->
 
+- Beta-test the [Rust Sokoban Tutorial](#rust-sokoban-tutorial);
 - [Embark's open issues][embark-open-issues] ([embark.rs]);
 - [winit's "Good first issue" and “help wanted” issues][winit-issues];
 - [gfx-rs's "contributor-friendly" issues][gfx-issues];