1. Install Go: Ensure that Go is installed on your machine. You can download and install Go from the official website: https://golang.org/dl/

2. Set up your project: Create a new directory for your project and navigate to it in your terminal.

3. Initialize Go module: Run the following command to initialize a Go module in your project directory:

   go mod init <module-name>
   

   Replace with the name of your project.

4. Install dependencies: Install the required packages by running the following commands:

   go get -u github.com/gin-gonic/gin
   go get -u github.com/jackc/pgx
   go get -u github.com/jackc/pgx/pgxpool
   go get -u github.com/golang-migrate/migrate/v4
   

5. Set up your database: Make sure you have a PostgreSQL database set up and running. Take note of the database connection details (host, port, username, password, database name).

6. Create a .env file: In your project's root directory, create a new file named .env and open it in a text editor.

   Add database credentials to .env file: Inside the .env file, add the following lines and replace the placeholders with your actual database credentials:

   dbUrl = "postgres://login:password@host:5432/dbname"
   

7. Use the Migrate package to manage your database migrations. You can use instructions from official github: https://github.com/golang-migrate/migrate

8. Clone or download your Golang project from your version control system (e.g., Git).

9. Build and run the project: In the terminal, navigate to the root directory of your project. Run the following command to build and run your project:

   go run .
   

   This command assumes that the main Go file is in the root directory and named main.go.

10. Endpoints:

    To save CSV data in the database, make a POST request to the endpoint

    http://localhost:<port>/promotions/csv
    

    To retrieve records by ID, make a GET request to the endpoint

    http://localhost:<port>/promotions/:id
    

    You can use a tool like cURL or Postman to send requests