mono: add hashes for license files

Signed-off-by: Angelo Compagnucci <angelo@amarulasolutions.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/mono/mono.hash

@@ -1,2 +1,5 @@
 # sha256 locally computed
 sha256 f0636baa0c1399805526142e799cb697ddccf736e506cf1a30a870eaa2830a89  mono-5.12.0.226.tar.bz2
+sha256 3b40a54878b5ac2767a764bd082f8772ab27c03b9da9c7328c4c4935725556f7  LICENSE
+sha256 fc488f3ec9f36856bea8cce5cdde1449176341ef93a3962b691970f8981799f4  mcs/COPYING
+sha256 2c3c3ef532828bcd42bb3127349625a25291ff5ae7e6f8d42e0fe9b5be836a99  external/Newtonsoft.Json/Tools/7-zip/copying.txt