Add Navigate Back In The Browser With Capybara as a ruby til

ruby/navigate-back-in-the-browser-with-capybara.md

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+# Navigate Back In The Browser With Capybara
+
+There are two ways to navigate back to a previous page. Capybara is driving
+the browser and it can be instructed to go back using its built-in command
+or by executing some JavaScript.
+
+```ruby
+page.go_back
+```
+
+or
+
+```ruby
+page.evaluate_script('window.history.back()')
+```