Add a few comments

src/index.ts

@@ -22,40 +22,49 @@ export class App {
     static async create(genesisData: WalletHDWatchGenesisData) {
         const debug = Debug('xpub');
 
+        // Create the storage for the app.
         debug('Creating storage...');
         const storage = await StorageSQLite.createOrOpen('xpub-backend.sqlite');
 
+        // Create the blockchain cache for the app.
         debug('Creating blockchain cache...');
         const blockchainCache = await storage.createOrGetStore('blockchain', {
             syncInMemory: false
         });
 
+        // Create the wallet cache for the app.
         debug('Creating wallet cache...');
         const walletCache = await storage.createOrGetStore('wallet', {
             syncInMemory: false
         });
 
+        // Create the blockchain for the app.
         debug('Creating blockchain...');
         const blockchain = await BlockchainElectrum.from({
             store: blockchainCache,
             servers: [ 'cashnode.bch.ninja' ]
         });
 
+        // Create the wallet for the app.
         debug('Creating wallet...');
         const wallet = await WalletHDWatch.from({
             blockchain,
             cache: walletCache
         }, genesisData);
 
+        // Create the routes for the app.
         debug('Creating Routes...');
         const routes = new WalletRoutes(wallet);
 
+        // Create the router for the app.
         debug('Creating Router...');
         const router = new HTTPService({ routes: [routes], debug });
 
+        // Create the app.
         debug('Creating App...');
         const app = new App({ blockchain, wallet, httpService: router, debug });
 
+        // Start the app.
         await app.start();
         return app;
 
@@ -66,6 +75,7 @@ export class App {
     async start() {
         this.deps.debug('Starting app...');
 
+        // Start the following services in parallel as they have no dependency on each other.
         await Promise.all([
             // Start the blockchain
             this.deps.blockchain.start()
@@ -80,6 +90,7 @@ export class App {
                 .then(() => this.deps.debug('Router started')),
         ]);
 
+        // Log the current RAM usage.
         this.deps.debug(`Current RAM usage: ${getCurrentRamUsage()} MB`);
         this.deps.debug('App started');
     }