Add extensions readme

Author: luc-github

extensions/click2go/README.md

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+This ESP3D-WebUI extension allows you to visualize and interact with a represention of the workspace of your machine. It offers the following features:
+
+* Display the workspace with X and Y axes, along with customizable graduations.  
+* Support for mouse and touch interactions, providing intuitive control.   
+* Real-time display of the machine coordinates of the cursor or touch point.   
+* Customizable UI styles using CSS variables.   
+* Customisable travel command to send to the machine.   
+* Customizable precision of the coordinates.   

extensions/gcodeViewer/README.md

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+This ESP3D-WebUI extension  is a WebGL-based G-code viewer designed to provide an interactive and high-performance visualization of G-code files directly in the web browser.   
+It offers the following features:  
+
+* Real-time 3D rendering of 3D printing toolpaths.   
+* Efficient loading and processing of large G-code files.  
+* Intuitive user interface with visualization controls.  
+* Dynamic filtering of print layers.  
+* Customizable viewing options (auto-rotation, axis inversion, etc.).  
+* Performance optimizations for smooth experience even with complex models.  
+
+> [!INFO]
+>### Note
+>  This extension is for 3D printers only, it will not work with CNC machines, an updated version is planned for the future.
+
+The package is built in /dist directory