Add pomodoro timer

src/pomodoro/utils.ts

@@ -0,0 +1,13 @@
+export function createMemoFunction<A, R>(method: (arg: A) => R): (arg: A) => R {
+  let previousArg: any
+  let previousResult: any
+  return function (arg) {
+    if (previousArg === arg) {
+      return previousResult
+    }
+
+    previousResult = method(arg)
+    previousArg = arg
+    return previousResult
+  }
+}