docs(regex-vis): add Regex visualizer & editor (#919)

Added Regex visualizer & editor

Features:

Visualizing regular expressions
Visual editing of regular expressions
Testing of regular expressions

Link: https://github.com/Bowen7/regex-vis

Author: ViktorSvertoka

README.md

@@ -596,6 +596,7 @@ There're also some great commercial libraries, like [amchart](https://www.amchar
 * [RegEx101](https://regex101.com/#javascript) - Online regex tester and debugger for JavaScript. Also supports Python, PHP and PCRE.
 * [RegExr](https://regexr.com/) - HTML/JS based tool for creating, testing, and learning about Regular Expressions.
 * [Regulex](https://jex.im/regulex/) - JavaScript Regular Expression Parser & Visualizer.
+* [Regex-Vis](https://regex-vis.com/) - Regex visualizer & editor.
 
 ## Voice Command