Clarify in root file that hw folder is licensed separately

LICENSE

@@ -1,3 +1,11 @@
+Hardware
+-----
+Hardware is licensed sperately under CC Attribution-NonCommercial 4.0 International. Refer to `hw/README.md`.
+
+
+Software
+-----
+
 ArdSCSino is copyright komatsu and licensed under the MIT license.
 ------
 MIT License
@@ -39,4 +47,4 @@ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.
 
 You should have received a copy of the GNU General Public License
-along with this program.  If not, see <https://www.gnu.org/licenses/>.
+along with this program.  If not, see <https://www.gnu.org/licenses/>.