Simple Wallet API

Write a simple wallet REST API.

We expect the following:

1. account deposits
2. account withdraws
3. balance enquiry
4. Mini statement

Added advantage:

1. Using Go Modules
2. Using Postgres.
3. Unit tests
4. Code coverage on the tests

Clearly document how to set up and run your application.

To run the app

go run ./cmd/server

To setup the app

go get ./...

To run tests

go test ./...

To run tests with coverage

go test ./... -cover