qitoolchain tutorial: document <license> tag
qitoolchain tutorial: document <license> tag

Change-Id: I21b450375e7173ac64690deb736811cadba67553
Reviewed-on: http://gerrit.aldebaran.lan/62935
Reviewed-by: dmerejkowsky <1e4b13000fa8777df4cefd2fd8215187e3deb062@aldebaran-robotics.com>
Tested-by: dmerejkowsky <1e4b13000fa8777df4cefd2fd8215187e3deb062@aldebaran-robotics.com>

aldebaran/qibuild,aldebaran/qibuild,aldebaran/qibuild,aldebaran/qibuild