[docs] event+commands for GPIO#N + Monitor added

docs/source/Plugin/P000_events.repl

@@ -219,3 +219,30 @@
 	   endon
 
    "
+   "
+   ``GPIO#N``
+   If the command "Monitor" is used to monitor a given pin you will receive an event for that GPIO
+   as soon as it's state changes. As seen in the example you can always use the square brackets
+   together with the task/value name of ``Plugin#GPIO#Pinstate#N`` to get the state, but to
+   trigger events you need to add the monitor command (preferably at boot).
+   ","
+
+   .. code-block:: html
+
+   on System#Boot do
+    Monitor GPIO,15
+    endon
+
+    on GPIO#15=0 do
+    if [Plugin#GPIO#Pinstate#13]=0
+      // do something
+    endif
+    endon
+
+    on GPIO#15=1 do
+    if [Plugin#GPIO#Pinstate#13]=1
+      // do something
+    endif
+    endon
+
+   "

docs/source/Plugin/P001_commands_GPIO.repl

@@ -31,7 +31,7 @@ Supported hardware: |P000_usedby_GPIO|
   GPIO: 0 ... 16
 
   ","
-  **Toggle on/off.**. 
+  **Toggle on/off.**.
   Toggle the current (output) state of the given GPIO pin.
   This will only be executed on pins set to be in output mode.
   "
@@ -116,3 +116,11 @@ Supported hardware: |P000_usedby_GPIO|
   A position value of 9000 will stop the PWM signal.
   This can be useful to save energy on servos which do not need power to remain at the same position.
   "
+  "
+  ``Monitor,<GPIO>``
+
+  GPIO: 0 ... 16
+  ","
+  **To monitor a GPIO state.**
+  By the use of the command you will receive events when the GPIO state of that pin is changed from 1 to 0 and from 0 to 1.
+  "