Create hex.md

Initial proposal to document this library

Author: MrKOSMOS

docs/library/hex.md

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+# HEX/HEX16/HEX8
+
+## Syntax
+
+
+```basic
+string32 = hex(n32)
+string16 = hex(n16)
+string8 = hex(n8)
+```
+Where `n32` is a 32-bit ULONG, `n16` is a 16-bit UINTEGER and `n8` is an 8-bit UBYTE.
+
+## Description
+
+* HEX:
+Takes one _32_ bit unsigned integer number and returns an 8 chars str containing the HEX string representation.
+* HEX16:
+Takes one _16_ bit unsigned integer number and returns a 4 chars str containing the HEX string representation.
+* HEX8:
+Takes one _8_ bit unsigned integer number and returns a 2 chars str containing the HEX string representation.
+
+## Requirements
+
+HEX, HEX16 and HEX8 can be included with the following command:
+
+```
+#include <hex.bas>
+```
+
+## See also
+