restructuring, config and readme

backend/README.md

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+# ng-blog Backend
+
+This is the backend service for the ng-blog project. It's written in Go and provides the API endpoints for the frontend application.
+
+## Getting Started
+
+### Prerequisites
+
+- Go (version 1.24 or higher)
+
+### Running the Backend
+
+The backend provides two main commands: `serve` and `help`.
+
+- **`serve`**: Starts the backend server. It loads configuration from environment variables and listens for incoming requests.
+
+  ```bash
+  go run ./cmd/main.go serve
+  ```
+
+- **`help`**: Displays usage information about the configuration options.
+
+  ```bash
+  go run ./cmd/main.go help
+  ```
+
+### Configuration
+
+The backend is configured using environment variables. The `help` command will display the available configuration options. The configuration is loaded using the `go-simpler.org/env` library. Environment variable names are expected to be in the format `CONFIG_OPTION_NAME`.
+
+## Directory Structure
+
+- `cmd/main.go`: The main entry point for the application. Handles command-line arguments and starts the server.
+- `internal/config`: Defines the configuration struct and default values.
+- `internal/startup`: Responsible for initializing the HTTP multiplexer and other startup tasks.