docs: add a mesh-mode screenshot to the README

README.md

@@ -12,6 +12,12 @@ A native macOS (Cocoa + OpenGL) viewer for the Microsoft Kinect, built directly
 `libfreenect`. It renders the depth and video streams in real time and exports the
 captured geometry to mesh files.
 
+![cocoaKinect rendering a live depth frame as a triangle mesh](docs/screenshot.jpg)
+
+*Mesh mode: the depth stream triangulated in real time, shaded by the built-in depth
+colormap — near surfaces warm, far ones cool. The wireframe density is the detail
+setting, which decimates the grid before triangulating it.*
+
 ## Features
 
 - Live depth, RGB and IR streams from the Kinect
@@ -28,6 +34,8 @@ captured geometry to mesh files.
 .
 ├── README.md                     This file
 ├── THIRD-PARTY-LICENSES.md       Licensing of every vendored dependency — read before redistributing
+├── docs/screenshot.jpg           Mesh mode, captured with the original 2010 build
+├── scripts/syntax-check.sh       Parses the sources against the current SDK (see below)
 ├── notes.txt                     Original author's notes (2010), verbatim
 └── src/
     ├── cocoaKinect.xcodeproj/    Project file (objectVersion 46, SDKROOT macosx10.6)