feat: set up project

README.md

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+# Bitcoin Payment Checker
+
+Bitcoin Payment Checker is a Go application that allows clients to pay for orders using Bitcoin. The application calculates the Bitcoin equivalent of the order amount, provides a wallet address for payment, and tracks the payment status.
+
+## Application Structure
+
+The application is structured into several packages:
+
+- `handler`: Contains the HTTP handlers for the application. The `OrderHandler` is responsible for processing new orders and calculating the Bitcoin price.
+- `services`: Contains various services used by the application, such as the `Order` service for managing orders and the `PriceConversor` service for converting USD to Bitcoin.
+- `main`: The entry point of the application. It sets up the database connection, initializes the services, and starts the HTTP server.
+
+## Key Files
+
+- `handler/order.go`: Contains the `OrderHandler` which processes new orders. It calculates the Bitcoin price of the order, stores the order in the database, and renders an HTML page with the order details.
+- `main.go`: The entry point of the application. It sets up the database connection, initializes the services, and starts the HTTP server.
+
+## Running the Application
+
+To run the application, you need to have Go installed. Then, you can run the application using the `go run` command:
+
+```bash
+go run main.go
+```
+
+This will start the application and listen for HTTP requests on the configured port.
+
+## Environment Variables
+
+The application uses the following environment variables:
+```
+    PAY_CHECKER_ENV: The environment the application is running in. If set to "dev", the application will load configuration from a .env file.
+    DB_ADDRESS: The address of the MongoDB database.
+    DB_NAME: The name of the MongoDB database.
+    ORDERS_COLLECTION: The name of the MongoDB collection for orders.
+    CONVERSOR_API: The API used for converting USD to Bitcoin.
+    RPC_HOST, RPC_AUTH, RPC_ZMQ, WALLET_ADDRESS: Configuration for the Bitcoin service.
+    MAIL_USER, MAIL_PASSWORD, MAIL_HOST, MAIL_PORT, MAIL_FROM, MAIL_TEMPLATES_DIR: Configuration for the mail service.
+```    
+
+## Dependencies
+
+The application uses several external packages:
+
+    gofiber/fiber/v2: For building the HTTP server and handling requests.
+    go.mongodb.org/mongo-driver/mongo: For connecting to and interacting with MongoDB.
+    net/smtp: For sending emails.