#165305239 Bookmark articles for reading later

[Siffersari]

What does this PR do?

• Adds implementation for bookmarking articles.

Description of Task to be completed?

• Implement bookmarking of articles
• Implement un-bookmarking of articles
• Style bookmark component
• Test bookmark component

How should this be manually tested?

• Clone the repository

    $ git clone https://github.com/andela/ah-the-jedi-frontend.git
  

• Switch to the ah-the-jedi-frontend directory

   $ cd ah-the-jedi-frontend/
  

• Switch to testing branch

   $ git checkout ft-view-edit-profile-165305225
  

• Install the project dependencies

  $  npm install
  

• Running the project

   $ npm start
  

• Login as a user

   $ <your-localhost>/login
  

• Navigate to view single article

   $ <your-localhost>/articles/slug
  

• Bookmark the article

• Unbookmark the article

What are the relevant pivotal tracker stories?

#165305239

Any background context you want to add?

• None

Screenshots