Add documenation about how to announce information with `RSpec`

[maxmeyer]

Summary

You can activate announcers via RSpec-metadata. This not documented right now.

Expected Behavior

Add documentation.

Current Behavior

No documentation about this.

Possible Solution

Add documentation

Steps to Reproduce (for bugs)

Look for documentation.

Context

Your Environment

• Version used: latest
• Operating System and version:
• Link to your project:

  Guidance

You can use the following template. Please add all announcers to the features/rspec/announce.feature.

Feature: Getting started with RSpec and aruba

  Background:
    Given I use the fixture "empty-app"

  Scenario: Configure Aruba via RSpec metadata

    Given a file named "spec/spec_helper.rb" with:
    """
    require 'aruba/rspec'
    """
    And a file named "spec/getting_started_spec.rb" with:
    """
    require 'spec_helper'
    RSpec.describe 'Configure Aruba with RSpec', :type => :aruba do
      context 'asdf', announce: true do
        it { expect(aruba).to be }
      end
    end
    """
    When I run `rspec`
    Then the specs should all pass

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[mvz]

Related to #391.