WordPress Option Page

// create custom plugin settings menu
add_action('admin_menu', 'rda_create_menu');

function rda_create_menu() {

	//create new top-level menu
	add_menu_page('RDA Plugin Settings', 'RDA Settings', 'administrator', __FILE__, 'rda_settings_page'
		,'dashicons-carrot');
	//call register settings function
	add_action( 'admin_init', 'register_mysettings' );
}


function register_mysettings() {
	//register our settings
	register_setting( 'rda-settings-group', 'new_option_name' );
	register_setting( 'rda-settings-group', 'some_other_option' );
}

function rda_settings_page() {
	?>
	<div class="wrap">
		<h2>RDA SETTINGS</h2>
		<form method="post" action="options.php">
			<?php settings_fields( 'rda-settings-group' ); ?>
			<table class="form-table">
				<tr valign="top">
					<th scope="row">New Option Name</th>
					<td><input type="text" name="new_option_name" value="<?php echo get_option('new_option_name'); ?>" /></td>
				</tr>
				<tr valign="top">
					<th scope="row">Some Other Option</th>
					<td><input type="text" name="some_other_option" value="<?php echo get_option('some_other_option'); ?>" /></td>
				</tr>
			</table>
			
			<p class="submit">
				<input type="submit" class="button-primary" value="<?php _e('Save Changes') ?>" />
			</p>
		</form>
	</div>
<?php } ?>