Added Serial prints stating Example name and File

[opticaldrive]

Thank you for creating a pull request to contribute to Adafruit's GitHub code! Before you open the request please review the following guidelines and tips to help it be more easily integrated:

• Describe the scope of your change--i.e. what the change does and what parts of the code were modified. This will help us understand any risks of integrating the code.

I added some serial prints to some examples.

• Describe any known limitations with your change. For example if the change doesn't apply to a supported platform of the library please mention it.

Could possibly make program run out of RAM faster.

• Please run any tests or examples that can exercise your modified code. We strive to not break users of the code and running tests/examples helps with this process. Currently Testing. Will update.

Thank you.

[opticaldrive]

Should the examples be changed to to use “F()” in serial prints to save RAM?