Added code snippets about downloading files (fixes #743)

docs/file-download.adoc

@@ -1,13 +1,64 @@
-== Accessing Files Downloaded with Browser
+== Downloading Files From Browser
+
+=== Downloading Files in Different Browsers
+
+==== Chrome
+
+.Downloading files with Java
+[source,java]
+----
+ChromeOptions chromeOptions = new ChromeOptions();
+chromeOptions.setExperimentalOption("prefs", new HashMap<String, Object>(){
+    {
+        put("profile.default_content_settings.popups", 0);
+        put("download.default_directory", "/home/selenium/Downloads");
+        put("download.prompt_for_download", false);
+        put("download.directory_upgrade", true);
+        put("safebrowsing.enabled", false);
+        put("plugins.always_open_pdf_externally", true);
+        put("plugins.plugins_disabled", new ArrayList<String>(){
+            {
+                add("Chrome PDF Viewer");
+            }
+        });
+    }
+});
+
+WebDriver driver = new RemoteWebDriver(new URL("http://localhost:4444/wd/hub"), chromeOptions);
+driver.navigate().to("http://example.com/myfile.odt");
+----
+
+==== Firefox
+
+.Downloading files with Java
+[source,java]
+----
+FirefoxOptions firefoxOptions = new FirefoxOptions();
+firefoxOptions.setCapability("moz:firefoxOptions", new HashMap<String, Object>(){
+    {
+        put("prefs", new HashMap<String, Object>(){
+            {
+                put("browser.helperApps.neverAsk.saveToDisk", "application/octet-stream");
+            }
+        });
+    }
+});
+
+
+WebDriver driver = new RemoteWebDriver(new URL("http://localhost:4444/wd/hub"), firefoxOptions);
+driver.navigate().to("http://example.com/myfile.odt");
+----
+
+=== Accessing Files Downloaded with Browser
 
 [NOTE]
 ====
-. This feature only works when browsers are run in containers.
+. This feature only works when browsers are being run in containers.
 . Files are accessible only when browser session is running.
 ====
 
 Your tests may need to download files with browsers. To analyze these files a common requirement is then to somehow extract downloaded files from browser containers. A possible solution can be dealing with container volumes. But Selenoid provides a `/download` API and dramatically simplifies downloading files. Having a running session `f2bcd32b-d932-4cdc-a639-687ab8e4f840` you can access all downloaded files using an URL:
 ```
 http://selenoid-host.example.com:4444/download/f2bcd32b-d932-4cdc-a639-687ab8e4f840/myfile.txt
 ```
-In order for this feature to work an HTTP file server should be listening inside browser container on port `8080`. Download directory inside container to be used in tests is usually `~/Downloads`.
+In order for this feature to work an HTTP file server should be listening inside browser container on port `8080`. Download directory inside container to be used in tests is usually `~/Downloads`.