feat: [#114] add example demonstrating dependency checking

Co-authored-by: josecelano <[email protected]>

Author: Copilot

packages/dependency-installer/examples/check_dependencies.rs

@@ -0,0 +1,43 @@
+//! Example: Check all development dependencies
+//!
+//! This example demonstrates how to use the dependency installer package
+//! to check if all required development dependencies are installed.
+//!
+//! Run with: `cargo run --example check_dependencies`
+
+use torrust_dependency_installer::{init_tracing, DependencyManager};
+
+fn main() {
+    // Initialize tracing for structured logging
+    init_tracing();
+
+    println!("Checking development dependencies...\n");
+
+    // Create dependency manager
+    let manager = DependencyManager::new();
+
+    // Check all dependencies
+    match manager.check_all() {
+        Ok(results) => {
+            println!("Dependency Status:");
+            println!("{}", "=".repeat(40));
+
+            for result in &results {
+                let status = if result.installed { "✓" } else { "✗" };
+                let status_text = if result.installed {
+                    "Installed"
+                } else {
+                    "Not Installed"
+                };
+
+                println!("{} {:20} {}", status, result.tool, status_text);
+            }
+
+            println!("\n{} dependencies checked", results.len());
+        }
+        Err(e) => {
+            eprintln!("Error checking dependencies: {}", e);
+            std::process::exit(1);
+        }
+    }
+}