add vault and mongo db with postgres in comments

vault/src/app.ts

@@ -0,0 +1,16 @@
+import express from 'express'
+import { buildClient } from './db'
+
+const app = express()
+
+const dbClient = buildClient('db', 'rushvault', 'rushvault', 'rushvault')
+
+app.get('/api/person', async (req, res) => {
+  res.status(200).send('potato!')
+})
+
+app.listen(8080, async () => {
+  console.log('starting on 8080')
+  dbClient.connect()
+  console.log(await dbClient.query('SELECT NOW()'))
+})

vault/src/db.ts

@@ -0,0 +1,24 @@
+import { Client } from 'pg'
+
+export function buildClient(
+  host: string,
+  user: string,
+  password: string,
+  database: string,
+) {
+  return new Client({ user, password, host, database })
+}
+
+// export class VaultDbClient {
+//   client: Client
+
+//   constructor(
+// host: string,
+// port: number,
+// user: string,
+// password: string,
+// database: string,
+//   ) {
+//     this.client = new Client({ user, password, host, port, database })
+//   }
+// }