Initial commit: MT firmware project

- BLE peripheral applications
- dr_piezo and bladder_patch projects

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

modules/nrfx/doc/nrf9160.dox

@@ -0,0 +1,54 @@
+/**
+@page nrf9160_drivers nRF9160 drivers
+@{
+
+@ref nrf_clock
+
+@ref nrf_systick
+
+@ref nrf_dppi
+
+@ref nrf_ficr
+
+@ref nrf_gpio
+
+@ref nrf_gpiote
+
+@ref nrf_i2s
+
+@ref nrf_kmu
+
+@ref nrf_nvmc
+
+@ref nrf_pdm
+
+@ref nrf_power
+
+@ref nrf_pwm
+
+@ref nrf_rtc
+
+@ref nrf_saadc
+
+@ref nrf_spim
+
+@ref nrf_spis
+
+@ref nrf_spu
+
+@ref nrf_swi_egu
+
+@ref nrf_timer
+
+@ref nrf_twim
+
+@ref nrf_twis
+
+@ref nrf_uarte
+
+@ref nrf_vmc
+
+@ref nrf_wdt
+
+@}
+*/