[add] an example for logical operators.

Author: vmarcella

examples/logical.ls

@@ -1,10 +1,12 @@
 var x = true;
 var y = false;
 
+// and is a valid keyword for returning true if both operands are true.
 if (x and y) {
     print "x and y are both true";
 }
 
+// or is a valid keyword for returning true if either operand is true.
 if (x or y) {
     print "Either x, y, or both are true!";
 }