Create basic usage example

examples/basic_usage.rs

@@ -0,0 +1,16 @@
+use rust_translate::{translate, translate_to_english, translate_from_english};
+
+#[tokio::main]
+async fn main() {
+    // Translate text from any language to any other language
+    let translated_text = translate("Bonjour le monde!", "fr", "en").await.unwrap();
+    println!("Translated text: {}", translated_text);
+
+    // Translate text to English
+    let english_text = translate_to_english("Bonjour le monde!").await.unwrap();
+    println!("Translated to English: {}", english_text);
+
+    // Translate text from English to any other language
+    let spanish_text = translate_from_english("Hello, world!", "es").await.unwrap();
+    println!("Translated to Spanish: {}", spanish_text);
+}