go: add «650. 2 Keys Keyboard»

Signed-off-by: Matej Focko <me@mfocko.xyz>

go/2-keys-keyboard.go

@@ -0,0 +1,14 @@
+package main
+
+func minSteps(n int) int {
+	steps := 0
+
+	for d := 2; n > 1; d++ {
+		for n%d == 0 {
+			steps += d
+			n /= d
+		}
+	}
+
+	return steps
+}