Copy writer to tmk_keyboard/keyboard/writer/ cd to this new folder
run make upload writer.hex with teensy loader (usar o usb na lateral direita)
Case you wanna build new firmware use kb.sized.io as reference, clean keymap.c, update Makefile
Usefull links
TMK Tutorial: https://deskthority.net/workshop-f7/how-to-build-your-very-own-keyboard-firmware-t7177.html#p141386
Little interface to help building (use json) http://kb.sized.io/
Layout Editor http://www.keyboard-layout-editor.com/
Tutorial http://blog.roastpotatoes.co/guide/2015/11/04/how-to-handwire-a-planck/