1. Navigate to the WordPress plugin directory of your development installation.
2. Create a new directory called ch10-book-review-dashboard-widget.
3. Navigate to the directory and create a text file called ch10-book-review-dashboard-widget.php.
4. Open the new file in a code editor and add an appropriate header at the top of the plugin file, naming the plugin Chapter 10 - Book Review Dashboard Widget.
5. Add the following line of code to register a function to be called when the dashboard contents are being prepared:

add_action( 'wp_dashboard_setup', 
            'ch10brdw_add_dashboard_widget' ); 

6. Add the following code segment to provide an implementation for the ch10brdw_add_dashboard_widget function:

function ch10brdw_add_dashboard_widget() { 
    wp_add_dashboard_widget( 'book_reviews_dashboard_widget', 
                             'Book Reviews', 
                             'ch10brdw_dashboard_widget' ); 
} 

7. Insert the following block of code to implement the ch10brdw_dashboard_widget function declared in the previous step:

function ch10brdw_dashboard_widget() {  
    $book_review_count = wp_count_posts( 'book_reviews' ); 
    if ( !empty( (array) $book_review_count ) ) {
    ?> 
    <a href="<?php echo add_query_arg( array(  
                                  'post_status' => 'publish', 
                                  'post_type' => 'book_reviews' ), 
                                  admin_url( 'edit.php' ) ); ?>"> 
    <strong> 
          <?php echo $book_review_count->publish; ?> 
    </strong> Published 
    </a> 
    <br /> 
    <a href="<?php echo add_query_arg( array(  
                                  'post_status' => 'draft', 
                                  'post_type' => 'book_reviews' ),  
                                  admin_url( 'edit.php' ) ); ?>"> 
    <strong> 
        <?php echo $book_review_count->draft; ?> 
    </strong> Draft 
    </a> 
<?php }
}

8. Save and close the plugin file.
9. Navigate to the Plugins management page and Activate the Chapter 10 - Book Review Dashboard Widget plugin.
10. Navigate to the website's Dashboard to see the new Book Reviews widget at the bottom of the page, as shown in the following screenshot: