Update Ground Types

Ground-Types.md

@@ -1,4 +1,7 @@
 Ground has 5 built-in types, which all hold a different purpose.
 
 - int: This stores a signed 64-bit integer. As CGround is written in C, integer overflow/underflow is **undefined behaviour**.
-- double: This stores the same values as a C double, i.e. 1 bit sign, 11 bit exponent, 52 bit mantissa.
+- double: This stores the same values as a C double, i.e. 1 bit sign, 11 bit exponent, 52 bit mantissa.
+- string:
+- char:
+- list: