Iot: Add bindings for LED Matrices

[krwq]

This will likely need more digging since there are many different kinds. I.e.:

• 8x8 LED Matrix Square Pixel - Yellow (https://www.adafruit.com/product/1819)
• 8x8 LED Matrix Ultra Bright Yellow-Green (https://www.adafruit.com/product/1045)
• Miniature 8x8 Yellow LED Matrix (https://www.adafruit.com/product/860)
• Mini 8x8 LED Matrix w/I2C Backpack - Red (https://www.adafruit.com/product/870)
• 16x8 LED Matrix Backpack - Green (https://www.adafruit.com/product/2035)
• 32x32 RGB LED Matrix Panel - 4mm Pitch (https://www.adafruit.com/product/607)

related issue: https://github.com/dotnet/iot/issues/11

I think this should be rather low level (i.e. light this LED at this position or map this 2d array into this LED matrix) and some other library(ies) should connect these issues together

[krwq]

@Ellerbach is starting to investigate (can't assign for whatever reason)

[mtripsky]

@Ellerbach do you need some help? I just joined and looking for some open issues. I noticed that it is one year already since it was created.

[Ellerbach]

@mtripsky I guess most has been don thru https://github.com/dotnet/iot/tree/master/src/devices#displays.
The 8x8 matrix can be driven by a MAX7219: https://github.com/dotnet/iot/blob/master/src/devices/Max7219/README.md
the large ones 32x32 by the RGBLedMatric driver: https://github.com/dotnet/iot/blob/master/src/devices/RGBLedMatrix/README.md
So my guess is that we should be able to close this one :-)

[joperezr]

I agree, @krwq feel free to reopen if there is still any display you had in mind that is not yet done.