feat: add dailyStats module for tracking daily request totals

src/dailyStats.js

@@ -0,0 +1,17 @@
+let dailyTotal = 0
+let yesterdayTotal = 0
+
+function increment() {
+  dailyTotal++
+}
+
+function getYesterdayTotal() {
+  return yesterdayTotal
+}
+
+function resetDay() {
+  yesterdayTotal = dailyTotal
+  dailyTotal = 0
+}
+
+module.exports = { increment, getYesterdayTotal, resetDay }