Add INT doc

Fixes #504

Author: boriel

docs/int.md

@@ -0,0 +1,32 @@
+#INT
+
+##Syntax
+
+
+```
+INT(numericExpression)
+```
+
+
+##Description
+
+Rounds the given expression by truncation. This function behaves
+exactly like the one in the Sinclair BASIC ROM.
+Argument must be a numeric expression. Returned value is a long (32 bit) number
+that will be casted (converted) to the required type.
+
+##Examples
+
+
+```
+REM Round by truncation
+LET a = 1.5
+PRINT "Int value of a is "; INT(a)
+REM 'Will print 1
+```
+
+
+##Remarks
+
+* This function is 100% Sinclair BASIC Compatible
+