how-tos made with markdown snippet injector

apps/tests/camera.md

@@ -0,0 +1,11 @@
+---
+nav-title: "camera How-To"
+title: "How-To"
+description: "Examples for using camera"
+---
+# Camera module
+Using a camera requires the camera module.
+<snippet id='camera-require'/>
+
+### Taking a picture.
+<snippet id='camera-take-picture'/>