west: add west.yml
west: add west.yml

This is the west manifest file for mainline zephyr.

For a burn-in period, we are going to keep west pointing at master to
avoid deps rolls as we iron out any kinks.  We can then set its
revision to a SHA after things settle down.

The projects key is mandatory (if there's only one repository, there
wouldn't be much need for west!) so we'll start things off with the
net-tools repository at its current master SHA.

Signed-off-by: Marti Bolivar <fd5da480b758a78208111e6ae5c6806e1f887137@foundries.io>

galak/zephyr,GiulianoFranchetto/zephyr,Vudentz/zephyr,GiulianoFranchetto/zephyr,GiulianoFranchetto/zephyr,explora26/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,galak/zephyr,Vudentz/zephyr,finikorg/zephyr,finikorg/zephyr,Vudentz/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,explora26/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,finikorg/zephyr,ldts/zephyr,ldts/zephyr,Vudentz/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,GiulianoFranchetto/zephyr,ldts/zephyr,explora26/zephyr,nashif/zephyr,explora26/zephyr,galak/zephyr,finikorg/zephyr,galak/zephyr,nashif/zephyr,ldts/zephyr,nashif/zephyr,GiulianoFranchetto/zephyr,ldts/zephyr,nashif/zephyr,explora26/zephyr,nashif/zephyr,zephyrproject-rtos/zephyr