samples: Add quickstarts to root module.

Fixes checkstyle errors in samples.

Author: tswast

translate/snippets/src/main/java/com/example/translate/QuickstartSample.java

@@ -32,11 +32,12 @@ public static void main(String... args) throws Exception {
     String text = "Hello, world!";
 
     // Translates some text into Russian
-    Translation translation = translate.translate(
-      text,
-      TranslateOption.sourceLanguage("en"),
-      TranslateOption.targetLanguage("ru")
-    );
+    Translation translation =
+        translate.translate(
+            text,
+            TranslateOption.sourceLanguage("en"),
+            TranslateOption.targetLanguage("ru"));
+
 
     System.out.printf("Text: %s%n", text);
     System.out.printf("Translation: %s%n", translation.translatedText());