Add some images to the FreetronicsLCD docs

libraries/FreetronicsLCD/BoolField.cpp

@@ -39,6 +39,8 @@
  * BoolField ledField(mainForm, "Status LED", "On", "Off", true);
  * \endcode
  *
+ * \image html FormBool.png
+ *
  * To actually toggle the LED, the application's main loop() function
  * should contain the following code:
  *

libraries/FreetronicsLCD/Form.cpp

@@ -41,6 +41,8 @@
  * Form mainForm(lcd);
  * TextField welcomeField(mainForm, "Form example", "v1.0");
  * \endcode
+ *
+ * \image html FormText.png
  */
 Form::Form(LiquidCrystal &lcd)
     : _lcd(&lcd)

libraries/FreetronicsLCD/IntField.cpp

@@ -49,6 +49,8 @@
  * IntField speedField(mainForm, "Speed", 0, 2000, 15, 450, " rpm");
  * \endcode
  *
+ * \image html FormInt.png
+ *
  * Use TextField for read-only fields that report integer values but
  * which are not modifiable by the user.
  *

libraries/FreetronicsLCD/TextField.cpp

@@ -34,6 +34,8 @@
  * TextField welcomeField(mainForm, "Form example", "v1.0");
  * \endcode
  *
+ * \image html FormText.png
+ *
  * As well as static messages, TextField can be used to display read-only
  * information that is computed at runtime:
  *

libraries/FreetronicsLCD/TimeField.cpp

@@ -48,6 +48,8 @@
  * }
  * \endcode
  *
+ * \image html FormTimeRO.png
+ *
  * A read-write field can be used to ask the user for the duration of an
  * application count-down timer:
  *
@@ -55,6 +57,8 @@
  * TimeField durationField(mainForm, "Timer duration", 24, TIMEFIELD_READ_WRITE);
  * \endcode
  *
+ * \image html FormTimeRW.png
+ *
  * \sa Field
  */