Added an example code to control Keyboard and Mouse from Arduino

[Arsh0508]

I really hope this example would be much more visible if it's directly in the library and hence can really help beginners.

[per1234]

As I brought up in https://github.com/arduino-libraries/Mouse/pull/13#issuecomment-598643770:

One thing to note is that this example already comes bundled with the Arduino IDE (and Arduino Web Editor) under File > Examples > 09.USB > KeyboardAndMouseControl.

It does make sense to bundle the examples with the library since the IDE bundled examples are not available to arduino-cli and Arduino Pro IDE users. I don't like the idea of having duplicate code to maintain, but it also could be problematic to remove the built-in sketches since there are likely tutorials that point people to that menu path. I suppose we could replace the content of the built in sketches with a comment like:

// This example has been moved to File > Examples > Mouse > KeyboardLogout

(should be adapted to make sense for Arduino Web Editor users also)

[Arsh0508]

@per1234 thanks your valuable feedback and time once again, will do the needful changes and let you know.

[Arsh0508]

I recommend also adding the layout and schematic files from https://github.com/arduino/Arduino/tree/master/build/shared/examples/09.USB/KeyboardAndMouseControl Sure sir, if you think that will help

[per1234]

This still isn't done:

Please spell the sketch name the same as in the existing example sketch: KeyboardAndMouseControl

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