Adds functions

Author: zenorocha

readme.md

@@ -14,6 +14,7 @@ So we decided to create a collection of cool hidden and not so hidden features,
 * [Conditionals](#conditionals)
 * [Loops](#loops)
 * [Special Characters](#special-characters)
+* [Functions](#functions)
 
 ## Namespace
 
@@ -188,3 +189,19 @@ So we decided to create a collection of cool hidden and not so hidden features,
 {lb} // left brace
 {rb} // right brace
 ```
+
+## Functions
+
+```
+{augmentMap(map1, map2)}
+{ceiling(number)}
+{floor(number)}
+{isNonnull(value)}
+{keys(map)}
+{length(list)}
+{max(number, number)}
+{min(number, number)}
+{randomInt(number)}
+{round(number)}
+{strContains(string, subString)}
+```