Update Adafruit_Arcada.h

[rollalt]

Use benefit of Arvada to be able to display .GIFs on Itsybitsy M4.
Future extension to use MakeCode Arcade scheme with buttons.

[rollalt]

Will this be reviewed?
Thanks.

[ladyada]

hiya please add details on how its wired up, and do not bump PR's - it can take a while for us to get to the 1200 github repos we maintain!

[rollalt]

@ladyada you are right, I've added the wrong pin configuration.
Now I've updated with correct pins.
The idea is to use "MakeCode Arcade" configuration. But for now I've added only the screen.
Please let me know if it is correct.
Thank you.

[ladyada]

hi you need to add the buttons too, and test them!

[Tijgerd]

Following:
https://learn.adafruit.com/makecode-arcade-with-samd51-m4/itsybitsy-m4-express

I think you need to add:
"A" = SCL
"B" = D7
"Up" = D9
"Right" = D10
"Left" = D11
"Down" = D12
"Menu" = SDA

this will result in:
#define ARCADA_BUTTONPIN_START ??SDA??
#define ARCADA_BUTTONPIN_SELECT ??SDA??
#define ARCADA_BUTTONPIN_A ??SCL??
#define ARCADA_BUTTONPIN_B 7
#define ARCADA_BUTTONPIN_UP 9
#define ARCADA_BUTTONPIN_DOWN 12
#define ARCADA_BUTTONPIN_LEFT 11
#define ARCADA_BUTTONPIN_RIGHT 10
//#define ARCADA_USE_SD_FS //don't know if this can be done?
#define ARCADA_USE_JSON
#define ARCADA_ACCEL_TYPE ARCADA_ACCEL_NONE

But then you also need to add some lines of code to Adafruit_Arcada.c in the function that reads the buttons..