Add Portuguese keyboard layout

[edgar-bonet]

As requested by @danielalexis in issue #76.

Closes #76.

[github-actions[bot]]

Memory usage change @ cbee5385c7e798587574609dfae0e1a42cfdebf8

Board	flash	%	RAM for global variables	%
arduino:avr:leonardo	0 - 0	0.0 - 0.0	0 - 0	0.0 - 0.0
arduino:sam:arduino_due_x_dbg	0 - 0	0.0 - 0.0	N/A	N/A
arduino:samd:mkrzero	0 - 0	0.0 - 0.0	0 - 0	0.0 - 0.0

Click for full report table

Board|examples/Serial
flash|%|examples/Serial
RAM for global variables|% -|-|-|-|- arduino:avr:leonardo|0|0.0|0|0.0 arduino:sam:arduino_due_x_dbg|0|0.0|N/A|N/A arduino:samd:mkrzero|0|0.0|0|0.0

Click for full report CSV

``` Board,examples/Serial
flash,%,examples/Serial
RAM for global variables,% arduino:avr:leonardo,0,0.0,0,0.0 arduino:sam:arduino_due_x_dbg,0,0.0,N/A,N/A arduino:samd:mkrzero,0,0.0,0,0.0 ```

[danielalexis]

OMG thank you so much!!

[edgar-bonet]

This pull request is ready for review. Is there something I can do to make it worth merging?

[facchinm]

Everything looks ok, I simply lost track of this PR :smiling_face_with_tear: Merging now, thx