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Update Reference.md

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@ -95,6 +95,12 @@ This is a **base class** from which all HomeSpan Characteristics are derived, an
* instantiated Characteristics are added to the HomeSpan HAP Database and associated with the last Service instantiated
* instantiating a Characteristic without first instantiating a Service throws an error during initialization
* a single, optional argument is used to set the initial value of the Characteristic at startup.
* a single, optional argument is used to set the initial value of the Characteristic at startup
* example: `new Characteristic::Brightness(50);`
The following methods are supported:
* `type T getVal<T>()`
* a template method that returns the current value of the Characteristic, after casting into the type *T* specified (e.g. *int*, *double*, etc.). If template parameter is excluded, value will be cast to *int*.
* Example with template specified: `double temp = Characteristic::CurrentTemperature->getVal<double>();`
* Example with template excluded : `int tilt = Characteristic::CurrentTiltAngle->getVal();`