[Wiki] Add Math Expansion to Hytale list

docs/users/placeholder-list/hytale.md

@@ -39,7 +39,7 @@ Further details on how to contribute to this list or the wiki as a whole can be
     - **L**
         - *No Expansions*
     - **M**
-        - *No Expansions*
+        - **[Math](#math)**
     - **N**
         - *No Expansions*
     - **O**
@@ -168,6 +168,19 @@ More information can be found on the [GitHub Repository](https://github.com/Plac
 
 ----
 
+### **Math**
+/// command | papi ecloud download Math
+///
+
+Allows evaluation of basic and complex mathematical Expressions through EvalEx.
+
+```
+%math_<expression>%
+%math_[decimals]:[rounding-mode]_<expression>%
+```
+
+----
+
 ### **Player**
 /// command | papi ecloud download Player
 ///