go: add «1823. Find the Winner of the Circular Game»

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

go/find-the-winner-of-the-circular-game.go

@@ -0,0 +1,11 @@
+package main
+
+func findTheWinner(n int, k int) int {
+	winner := 0
+
+	for i := 2; i <= n; i++ {
+		winner = (winner + k) % i
+	}
+
+	return winner + 1
+}