updated demos documentation

Demos.md

@@ -21,6 +21,26 @@ If your target is desktop, alternatively you can load `demo/browser.js` directly
 
 <br>
 
+### Demo Options
+
+Demo implements several ways to use `Human` library,  
+all configurable in `browse.js:ui` configuration object and in the UI itself: 
+
+- `ui.buffered`: run detection and screen refresh in a sequence or as separate buffered functions
+- `ui.bufferedFPSTarget`: when using buffered execution this target fps for screen refresh
+- `ui.useWorker`: run processing in main thread or dedicated web worker thread
+- `ui.crop`: resize camera input to fit screen or run at native resolution
+- `ui.facing`: use front or back camera if device has multiple cameras
+- `ui.modelsPreload`: pre-load all enabled models on page load
+- `ui.modelsWarmup`: warmup all loaded models on page load
+- `ui.useDepth`: draw points and polygons with different shade depending on detected Z-axis depth
+- `ui.drawBoxes`: draw bounding boxes around detected objects (e.g. face)
+- `ui.drawPoints`: draw each deteced point as point cloud
+- `ui.drawPolygons`: connect detected points with polygons
+- `ui.fillPolygons`: fill drawn polygons
+
+<br>
+
 ### Dev Server
 
 To use dev server, you must have an SSL certificate since browsers enforce *https* for webcam access  

Usage.md

@@ -34,6 +34,7 @@ Additionally, `Human` library exposes several objects and methods:
                       // progresses through: 'config', 'check', 'backend', 'load', 'run:<model>', 'idle'
   human.load(config)  // explicitly call load method that loads configured models
                       // if you want to pre-load them instead of on-demand loading during 'human.detect()'
+  human.image(image, config?) // runs image processing without detection and returns canvas
 ```
 
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