Add extension https://github.com/RobbyZero/Advanced-Math

Fixes #139

Author: UnsignedArduino

content/extensions/068-RobbyZero---Advanced-Math.md

@@ -0,0 +1,9 @@
+---
+repo: "https://github.com/RobbyZero/Advanced-Math"
+links:
+  - title: Forum post
+    url: >-
+      https://forum.makecode.com/t/advanced-math-extension/29010?u=unsignedarduino
+---
+
+This extension provides blocks to use calculus, linear algebra, cryptography, exponentials and logarithms, and dealing with trigonometry. Also, the calculus blocks look incredibly funny so I recommend checking them out. This extension adds five categories: `Cryptography`, `Calculus`, `Exponential/Log`, `Trig Modes`, and `LinearAlgebra` to the toolbox.