Add project euler example 5

examples/euler5.nek

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+// 2520 is the smallest number that can be divided by each of the numbers from 1 to 10 without any remainder.
+// What is the smallest positive number that is evenly divisible by all of the numbers from 1 to 20?
+// 
+// Correct Answer: 232_792_560
+
+num <- 20;
+should_continue <- 1;
+i <- 2;
+
+loop should_continue {
+    should_continue = 0;
+
+    i = 20;
+    loop i >= 2; i = i - 1 {
+        if num % i != 0 {
+            should_continue = 1;
+            
+            // break
+            i = 0;
+        }
+    }
+
+    if should_continue == 1 {
+        num = num + 20;
+    }
+}
+
+print num;