Added navwalker.php and readme.

Readme.md

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+1) Place navwalker.php in your WordPress theme folder /wp-content/your-theme/
+
+2) To use Bulma-navwalker add these lines to your functions.php
+
+require_once('navwalker.php');
+register_nav_menus( array(
+    'primary' => __( 'Primary Menu', 'missionfit' ),
+) );
+
+3) Then add this initializer in your header (either index.php, header.php, etc...)
+    wp_nav_menu( array(
+        'theme_location'    => 'primary',
+        'depth'             => 2,
+        'container'         => false,
+        // 'items_wrap'        => 'div',
+        'menu_class'        => 'navbar-menu',
+        'menu_id'           => 'primary-menu',
+        'after'             => "</div>",
+        'walker'            => new Navwalker())
+    );
+
+3) Congratulations you are now using Bulma!

navwalker.php

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+<?php
+/**
+ * Bulma-Navwalker
+ *
+ * @package Bulma-Navwalker
+ */
+
+/**
+ * Class Name: Navwalker
+ * Plugin Name: Bulma Navwalker
+ * Plugin URI:  https://github.com/Poruno/Bulma-Navwalker
+ * Description: An extended Wordpress Navwalker object that displays Bulma framework's Navbar https://bulma.io/ in Wordpress.
+ * Author: Carlo Operio - https://www.linkedin.com/in/carlooperio/, Bulma-Framework
+ * Author URI: https://github.com/wp-bootstrap
+ * License: GPL-3.0+
+ * License URI: https://github.com/Poruno/Bulma-Navwalker/blob/master/LICENSE
+ */
+
+	class Navwalker extends Walker_Nav_Menu {
+
+        public function start_lvl( &$output, $depth = 0, $args = array() ) {
+
+            $output .= "<div class='navbar-dropdown'>";
+        }
+
+        public function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {
+
+            $liClasses = 'navbar-item '.$item->title;
+
+            $hasChildren = $args->walker->has_children;
+            $liClasses .= $hasChildren? " has-dropdown is-hoverable": "";
+
+            if($hasChildren){
+                $output .= "<div class='".$liClasses."'>";
+                $output .= "\n<a class='navbar-link' href='".$item->url."'>".$item->title."</a>";
+            }
+            else {
+                $output .= "<a class='".$liClasses."' href='".$item->url."'>".$item->title;
+            }
+
+            // Adds has_children class to the item so end_el can determine if the current element has children
+            if ( $hasChildren ) {
+                $item->classes[] = 'has_children';
+            }
+        }
+
+        public function end_el(&$output, $item, $depth = 0, $args = array(), $id = 0 ){
+
+            if(in_array("has_children", $item->classes)) {
+
+                $output .= "</div>";
+            }
+            $output .= "</a>";
+        }
+
+        public function end_lvl (&$output, $depth = 0, $args = array()) {
+
+            $output .= "</div>";
+        }
+    }
+?>