feat: add CLI commands and server default behavior

- Introduced CLI commands for server, login, upload, sign, verify, and more using `clap`.
- Updated Dockerfile and docker-compose to default to `server` command on startup.
- Enhanced `test_local.sh` for testing the server and client operations.
- Added multipart support to `reqwest` and new CLI documentation in `README.md`.
- Updated `Cargo.toml` with new dependencies to support CLI and multipart uploads.

README.md

@@ -7,6 +7,7 @@ This project implements a hierarchical document signing system using HashiCorp V
 - **Hierarchical Signing**: Requires 3 of 5 signatures to validate a document, with at least 1 signature from each department
 - **Department Structure**: Two departments (Legal and Finance) with 5 users each
 - **Document API**: Upload, sign, and verify documents through a RESTful API
+- **CLI Client**: Interact with the system through command-line interface
 - **Vault Integration**: Leverages HashiCorp Vault's Transit engine for cryptographic operations
 
 ## System Architecture
@@ -50,7 +51,46 @@ The system consists of:
    - Legal department: legal1/legal1pass through legal5/legal5pass
    - Finance department: finance1/finance1pass through finance5/finance5pass
 
-### API Usage Examples
+### CLI Commands
+
+The project includes a command-line interface to interact with the API:
+
+1. **Start the Server**:
+   ```bash
+   cargo run server [--vault-addr URL] [--api-port PORT]
+   ```
+
+2. **Login**:
+   ```bash
+   cargo run login --username USER --password PASS [--api-url URL]
+   ```
+
+3. **Upload Document**:
+   ```bash
+   cargo run upload --name NAME --file PATH [--api-url URL]
+   ```
+
+4. **Sign Document**:
+   ```bash
+   cargo run sign --document-id ID --username USER --token TOKEN [--api-url URL]
+   ```
+
+5. **Verify Document**:
+   ```bash
+   cargo run verify --document-id ID [--api-url URL]
+   ```
+
+6. **List Documents**:
+   ```bash
+   cargo run list [--api-url URL]
+   ```
+
+7. **Get Document Details**:
+   ```bash
+   cargo run get --document-id ID [--api-url URL]
+   ```
+
+### API Usage Examples (curl)
 
 1. **Login**:
    ```bash