docs: update "Related Projects for CodeIgniter 4.x"

Author: kenjis

README.md

@@ -130,5 +130,24 @@ $ vendor/bin/phpunit
 
 ## Related Projects for CodeIgniter 4.x
 
-- [CodeIgniter4 Application Template](https://github.com/kenjis/ci4-app-template)
+### Libraries
+
+- [CodeIgniter 3 to 4 Upgrade Helper](https://github.com/kenjis/ci3-to-4-upgrade-helper)
 - [CodeIgniter3-like Captcha](https://github.com/kenjis/ci3-like-captcha)
+- [PHPUnit Helper](https://github.com/kenjis/phpunit-helper)
+- [CodeIgniter4 Attribute Routes](https://github.com/kenjis/ci4-attribute-routes)
+- [CodeIgniter Simple and Secure Twig](https://github.com/kenjis/codeigniter-ss-twig)
+- [CodeIgniter4 Viewi Demo](https://github.com/kenjis/ci4-viewi-demo)
+
+### Tutorials
+
+- [CodeIgniter 4 News Tutorial](https://github.com/kenjis/ci4-news)
+- [CodeIgniter 4 Validation Tutorial](https://github.com/kenjis/ci4-validation-tutorial)
+- [CodeIgniter4 Code Modules Test](https://github.com/kenjis/ci4-modules-test)
+- [CodeIgniter 4 File Upload](https://github.com/kenjis/ci4-file-upload)
+
+### Building Development Environment
+
+- [CodeIgniter4 Application Template](https://github.com/kenjis/ci4-app-template)
+- [CodeIgniter4 Composer Installer](https://github.com/kenjis/ci4-composer-installer)
+- [docker-codeigniter-apache](https://github.com/kenjis/docker-codeigniter-apache)