add starter code

.env.sample

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+DATABASE_URL=

.gitignore

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+node_modules
+.env

README.md

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+# Starter code: Node.js, Express, & PostgreSQL
+
+This starter code is intended to be run for the Node.js, Express, & PostgreSQL module in the Thinkful curriculum.
+
+## Existing files
+
+As you work through the Node.js, Express & PostgreSQL module, you will be writing code that allows your controllers to connect to and query your PostgreSQL database via [Knex](http://knexjs.org/). The table below describes the files and folders in the starter code:
+
+| Folder/file path                 | Description                                                                                                           |
+| -------------------------------- | --------------------------------------------------------------------------------------------------------------------- |
+| `src/app.js`                     | Directs requests to the appropriate routers.                                                                          |
+| `src/server.js`                  | Starts the server on `localhost:5000` by default.                                                                     |
+| `src/products/`                  | A folder that contains the `products.controller.js` and `products.router.js` files for the `products` resource.       |
+| `src/categories/`                | A folder that contains the `categories.controller.js` and `categories.router.js` files for the `categories` resource. |
+| `src/suppliers/`                 | A folder that contains the `suppliers.controller.js` and `suppliers.router.js` files for the `suppliers` resource.    |
+| `src/db/`                        | An empty folder where you will add migration and seed files for your database later on.                               |
+| `src/errors/methodNotAllowed.js` | An error handler for forbidden request methods                                                                        |
+| `.env.sample`                    | A sample environment configuration file                                                                               |
+
+In the `*.controller.js` files, the route handlers return hard-coded data for now, but later on, you will modify the controllers to manipulate and return data from a PostgreSQL database.
+
+This starter code closely follows the best practices and patterns established in the Robust Server Structure module.
+
+## Database setup
+
+1. Set up a new ElephantSQL database instance by following the instructions in the "PostgreSQL: Creating & Deleting Databases" checkpoint.
+1. After setting up your database instance, connect DBeaver to your new database instance by following the instructions in the "PostgreSQL: Installing DBeaver" checkpoint.
+
+## Installation
+
+1. Fork and clone this repository.
+1. Run `cp .env.sample .env`.
+1. Update your `.env` file with a connection URL to your ElephantSQL database instance.
+1. Run `npm install` to install project dependencies.
+1. Run `npm run start:dev` to start your server in development mode.
+1. In your browser or Postman, navigate to `localhost:5000/products`. If your server is running properly, you should get back the following json response:
+
+```json
+{
+  "data": [
+    {
+      "product_title": "product 1"
+    },
+    {
+      "product_title": "product 2"
+    }
+  ]
+}
+```
+
+If you have trouble getting the server to run, reach out for assistance.