How to add Custom Settings to Wordpress Appearance Customize Section

functions.php

<?php
/**
* Custom Wordpress Customize Settings -- By Darshan Gada
* @param webgeeks (Replace webgeeks with your theme name)
* @function webgeeks_theme_options
*/

function webgeeks_theme_options( $wp_customize ) {
    //Sections, settings and controls will be added here
    
    //Custom Setting for Header Logo Image
    //Adding Section
    $wp_customize->add_section(
        'webgeeks_theme_settings',
        array(
            'title'         =>  __('Webgeeks Theme Settings','webgeeks'),
            'priority'      =>  100,
            'capability'    => 'edit_theme_options',
            'description'   =>  __('Change theme settings here.', 'webgeeks'),
        )
    );

    //Adding Header Logo Settings
    $wp_customize->add_setting('header_logo');

    //Adding Header Logo Control
    $wp_customize->add_control(
        new WP_Customize_Upload_Control($wp_customize, 'header_logo',
            array(
                'label'     =>  __('Header Logo', 'webgeeks'),
                'section'   =>  'webgeeks_theme_settings',
                'settings'  =>  'header_logo',
            )
        )
    );
  
  
    //Custom Settings for Footer Logo
    //Adding Footer Logo Settings
    $wp_customize->add_setting('footer_logo');

    //Adding Footer Logo Control
    $wp_customize->add_control(
        new WP_Customize_Upload_Control($wp_customize, 'footer_logo',
            array(
                'label'     =>  __('Footer Logo', 'webgeeks'),
                'section'   =>  'webgeeks_theme_settings',
                'settings'  =>  'footer_logo',
            )
        )
    );

    //Custom Settings for Footer Contact Section
    //Adding Footer Contact Section Settings
    $wp_customize->add_setting('footer_contact_address',
        array(
            'default'   =>  'Address'
        )
    );

    //Adding Footer Contact Section Control
    $wp_customize->add_control(
        'footer_contact_address',
        array(
            'label'     =>  'Footer Contact Address',
            'section'   =>  'webgeeks_theme_settings',
            'type'      =>  'textarea',
            'settings'  =>  'footer_contact_address',
        )
    );

}

//Applying function to Appearance>Customize Menu
add_action('customize_register', 'webgeeks_theme_options');

//Set Default Theme Options to Variables
function update_theme_options() {
    $header_logo = get_option('header_logo', get_stylesheet_directory_uri().'/assets/images/logo.png');
    $footer_logo = get_option('footer_logo', get_stylesheet_directory_uri().'/assets/images/big-logo.png');
    $footer_contact_address = get_option('footer_contact_address','Test');
?>

<!-- Get User Customised Data and Inject it with Javascript inside Divs -->
<script type="text/javascript">
    jQuery(document).ready(function() {
        jQuery('.logo').html('');
        jQuery('.logo').html('<img src="<?=$header_logo;?>" class="img-responsive"/>');
        jQuery('.footer-logo').html('');
        jQuery('.footer-logo').html('<img src="<?=$footer_logo;?>" class="img-responsive"/>');
        jQuery('.footer-text').html('');
        jQuery('.footer-text').html('<p>CONTACT US<br/><?=$footer_contact_address;?></p>');
    });
</script>
<?php } add_action( 'wp_head', 'update_theme_options' ); ?>*/