Add a new role to WORDPRESS who can manage users

functions.php

/**
  * Add a default client user role
  *
  * @author - lewismcarey
  *
  */

function create_site_manager_user_role() {

	$result = add_role(

		'site_manager',
		'Site Manager',
		array(

			'activate_plugins'  	=> false,
			'delete_others_pages'	=> true,
			'delete_others_posts'	=> true,
			'delete_pages'          => true,
			'delete_plugins'	=> false,
			'delete_posts'		=> true,
			'delete_private_pages'  => true,
			'delete_private_posts'  => true,
			'delete_published_pages'=> true,
			'delete_published_posts'=> true,
			'edit_dashboard'	=> false,
			'edit_files'		=> true,
			'edit_others_pages'	=> true,
			'edit_others_posts'	=> true,
			'edit_pages'		=> true,
			'edit_posts'		=> true,
			'edit_private_pages'  	=> true,
			'edit_private_posts'  	=> true,
			'edit_published_pages' 	=> true,
			'edit_published_posts' 	=> true,
			'edit_theme_options'  	=> false,
			'export'		=> false,
			'import'		=> false,
			'list_users'		=> true,
			'manage_categories'	=> true,
			'manage_links'		=> true,
			'manage_options'	=> true,
			'moderate_comments'	=> true,
			'promote_users'		=> true,
			'publish_pages'		=> true,
			'publish_posts'		=> true,
			'read_private_pages'  	=> true,
			'read_private_posts'  	=> true,
			'read'			=> true,
			'remove_users'		=> true,
			'switch_themes'		=> false,
			'upload_files'		=> true,
			'create_product'	=> true,
			'update_core'		=> false,
			'update_plugins'	=> false,
			'update_themes'		=> false,
			'install_plugins'	=> false,
			'install_themes'	=> false,
			'delete_themes'		=> false,
			'edit_plugins'		=> false,
			'edit_themes'		=> false,
			'edit_users'		=> true,
			'create_users'		=> true,
			'delete_users'		=> true,
			'unfiltered_html'	=> true
		
		)
	
	);

}

add_action( 'admin_init', 'create_site_manager_user_role' );

WORDPRESS Add custom role

# WORDPRESS Add custom role
  
  This function adds an additional role called site manager. 
  This is primarily to allow a client admin rights ( including managing users ) 
  It enables you to then hide administrator admin menu items from site managers.
  
  ## Usage
  
  * add below code to functions.php