Add @TheGuideKnight's 2D tutorial series to Tutorials and resources (#4592)

The playlist contains a tutorial for a 2D Breakout game, done entirely
in Godot.

community/tutorials.rst

@@ -36,6 +36,7 @@ Video tutorials
 - `Code with Tom <https://www.youtube.com/playlist?list=PLiUQR4U_J9ec0k91iHPme_qtfS1nrWF3W>`_ (2D and 3D, GDScript).
 - `BornCG <https://www.youtube.com/playlist?list=PLda3VoSoc_TSBBOBYwcmlamF1UrjVtccZ>`_ (2D and 3D, GDScript).
 - `Gonkee <https://www.youtube.com/channel/UCJqCPFHdbc6443G3Sz6VYDw>`_ (2D and 3D, GDScript, Shaders).
+- `TheGuideKnight <https://www.youtube.com/playlist?list=PLYcTJBw32KtX2fvOdtO_fS3Nd6sxM71tn>`_ (2D, GDScript).
 
 Text tutorials
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