docs -add qtdragon/qtvcp to user introduction exapmles

Author: c-morley

docs/src/user/images/qtdragon.png

@@ -138,6 +138,13 @@ image::images/tklinuxcnc_fr.png["TkLinuxCNC graphical interface",align="center"]
 
 Xemc:: an X-Window program
 
+QtDragon:: <<cha:qtdragon-gui,QtDragon>>, a touch screen GUI based on QtVCP using the PyQt5 library. It comes in two versions 
+'QtDragon' and 'QtDragon_hd'. They are very similar in features but QtDragon_hd is made for larger monitors.
+
+[[fig:QtDragon-graphical-interface]]
+.QtDragon, a touch screen GUI based on QtVCP
+image::images/qtdragon.png["QtDragon, a touch screen GUI based on QtVCP",align="center"]
+
 halui:: A HAL based user interface allowing to control LinuxCNC using buttons and switches
 
 linuxcncrsh:: A telnet based user interface allowing to send commands from remote computers.
@@ -165,6 +172,14 @@ GladeVCP:: <<cha:glade-vcp,'GladeVCP'>>, a Glade-based virtual control panel tha
 .GladeVCP Example Embedded Into AXIS GUI
 image::../gui/images/axis-gladevcp.png["GladeVCP embedded into AXIS",align="center"]
 
+QtVCP:: <<cha:qtvcp,'QtVCP'>>, a PyQT5-based virtual control panel that can be added to most GUIs or run as a standalone panel.
+  QtVCP has the advantage over PyVCP in that it is not limited to the display or control of HAL virtual signals,
+  but can include other external interfaces outside LinuxCNC such as window or network events by extending with python code.
+  QtVCP is also more flexible in how it may be configured to appear on the GUI with many special widgets:
+
+.QtVCP Example Embedded Into QtDragon GUI
+image::../gui/images/qtvcp_spindle_belts.png["QtVCP panel embedded into QtDragon",align="center"]
+
 == Languages
 
 LinuxCNC uses translation files to translate LinuxCNC User Interfaces into many languages including