Start add account endpoint

data/dbConfig.js

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+const pgp = require('pg-promise')();
+
+const db = pgp(process.env.DATABASE_URL);
+
+module.exports = db;

data/how_to_do_migration.md

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+## How to do a migration
+ - Create `.env` to the root folder
+ - Add the database url to the `.env` file: 
+ `DATABASE_URL=postgres://username:password@host:port/database`
+ - Run `npm run migrate up`