added multiples_of_3_and_5 in go

Author: Alexander Wormuth

multiples_of_3_and_5/go/multiples.go

@@ -0,0 +1,22 @@
+/* 
+	Multiples of 3 and 5
+	This program sums up all the multiples of 3 and 5 under 1000.
+*/ 
+
+package main
+
+import "fmt"
+
+func main() {
+	sum := 0
+
+	for i := 0; i < 1000; i++ {
+		if i % 3 == 0 || i % 5 == 0 {
+			sum += i
+		}
+	}
+
+	fmt.Println(sum)
+}
+
+