another aoc solution

examples/puzzles/euler_07.zr

@@ -0,0 +1,13 @@
+func main[] : I64
+    let sum: I64 = 0
+    let a: I64 = 0
+    let b: I64 = 1
+
+    while a < 4000000
+        if a % 2 == 0
+            sum = sum + a
+        let temp: I64 = b
+        b = a + b
+        a = temp
+
+    io.println_i64(sum)