Rearrange docu in /help and correct some examples

help/PropsAction.md

@@ -0,0 +1,57 @@
+# *PropsAction* class reference
+
+*PropsAction* brings asynchronous-like behavior to sketch `loop()`.
+
+
+## Constructors
+* `PropsAction()`
+* `PropsAction(unsigned long interval, void (*function)())`
+
+`function` is the callback executed at every `interval` milliseconds.
+
+## Members
+* `void reset(unsigned long interval)`
+* `void disable()`
+* `void enable()`
+* `void check()`
+* `bool tick()`
+* `unsigned long getInterval()`
+
+## Usage
+
+### Create a callback
+```csharp
+void clignote()
+{
+  if (clignoter.value()) {
+    digitalWrite(LED_BUILTIN, !digitalRead(LED_BUILTIN));
+    led.setValue(digitalRead(LED_BUILTIN));
+  }
+}
+```
+
+### Create a *PropsAction* instance
+```csharp
+PropsAction clignoteAction = PropsAction(1000, clignote); // interval every 1000 milliseconds
+```
+
+### Call the instance `check()` method ine the sketch `loop()`
+```csharp
+void loop()
+{
+  ...
+
+  clignoteAction.check(); // do your stuff, don't freeze the loop with delay() calls
+
+  ...
+}
+```
+
+
+## Author
+
+**Marie FAURE** (Oct 18th, 2019)
+* company: FAURE SYSTEMS SAS
+* mail: *dev at faure dot systems*
+* github: <a href="https://github.com/fauresystems?tab=repositories" target="_blank">fauresystems</a>
+* web: <a href="https://www.live-escape.net/" target="_blank">Live Escape Grenoble</a>