Added constant and enums

contributors/LevelSilence/Backend/.gitignore

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+node_modules
+.env

contributors/LevelSilence/Backend/constants/subscriptionConstants.js

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+const BILLING_CYCLES = {
+  MONTHLY: "monthly",
+  YEARLY: "yearly",
+};
+
+const SUBSCRIPTION_CATEGORIES = {
+  ENTERTAINMENT: "entertainment",
+  EDUCATION: "education",
+  PRODUCTIVITY: "productivity",
+  UTILITIES: "utilities",
+  OTHER: "other",
+};
+
+const SUBSCRIPTION_STATUSES = {
+  ACTIVE: "active",
+  TRIAL: "trial",
+  CANCELLED: "cancelled",
+  EXPIRED: "expired",
+};
+
+const SUBSCRIPTION_SOURCES = {
+  MANUAL: "manual",
+  GMAIL: "gmail",
+  STRIPE: "stripe",
+  RAZORPAY: "razorpay",
+};
+
+module.exports = {
+  BILLING_CYCLES,
+  SUBSCRIPTION_CATEGORIES,
+  SUBSCRIPTION_STATUSES,
+  SUBSCRIPTION_SOURCES,
+};

contributors/LevelSilence/Backend/db.js

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+const mongoose = require("mongoose");
+
+const connectDB = async () => {
+  try {
+    const connection = await mongoose.connect(process.env.MONGO_URI);
+    console.log(`MongoDB connected: ${connection.connection.host}`);
+  } catch (err) {
+    console.error("MongoDB connection error:", err.message);
+    process.exit(1);
+  }
+};
+
+module.exports = connectDB;