Added BookDetails cbv in views and its corresponding book_details.html. Made minor tweaks in models and book template.

Deleted temporary books view. Added BooksListView cbv in views and made necessary changes in models and urls. Fixed books.html to match the expected output.

Created templates folder in project with a project-level template base.html. Changed the settings to include project-level templates.

Added Author and Books models in bookshelf App. Included bookshelf in installed_apps of settings. Migrated models of bookshelf.