Add tutorial for building a Rust Text Editor.

Link to the link -- https://www.philippflenker.com/hecto/

README.md

@@ -354,6 +354,7 @@ This repository is a compilation of well-written, step-by-step guides for re-cre
 * [**Python**: _Python Tutorial: Make Your Own Text Editor_](https://www.youtube.com/watch?v=xqDonHEYPgA) [video]
 * [**Python**: _Create a Simple Python Text Editor!_](http://www.instructables.com/id/Create-a-Simple-Python-Text-Editor/)
 * [**Ruby**: _Build a Collaborative Text Editor Using Rails_](https://blog.aha.io/text-editor/)
+* [**Rust**: _Hecto: Build your own text editor in Rust_ ](https://www.philippflenker.com/hecto/)
 
 #### Build your own `Visual Recognition System`