added base examples and drills

kata/notifications/original/README.md

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+# notifications original
+
+Messy reminder logic mixing quiet-hours rules, channel checks, time, logging, mutation, and file I/O.

kata/notifications/original/notificationService.js

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+const fs = require("fs");
+
+function sendReminder(filePath, userId, channel) {
+  const raw = fs.readFileSync(filePath, "utf8");
+  const state = JSON.parse(raw);
+  const user = state.users.find((item) => item.id === userId);
+
+  if (!user) {
+    throw new Error("User not found");
+  }
+
+  if (!user.remindersEnabled) {
+    return { sent: false, reason: "disabled" };
+  }
+
+  const hour = new Date().getHours();
+
+  if (hour < 8 || hour > 20) {
+    return { sent: false, reason: "quiet-hours" };
+  }
+
+  if (channel === "sms" && !user.phoneNumber) {
+    return { sent: false, reason: "missing-phone" };
+  }
+
+  user.lastReminderAt = new Date().toISOString();
+  fs.writeFileSync(filePath, JSON.stringify(state, null, 2));
+  console.log("Sent reminder", userId, channel);
+
+  return { sent: true, channel };
+}
+
+module.exports = { sendReminder };

kata/notifications/original/state.json

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+{
+  "users": [
+    {
+      "id": "user-1",
+      "remindersEnabled": true,
+      "phoneNumber": "+15555555555",
+      "lastReminderAt": null
+    }
+  ]
+}