Added reference to license at the end of readme

LICENSE

@@ -1,4 +1,4 @@
-This is a Zero-Clause BSD (0BSD) license.
+This is the Zero-Clause BSD (0BSD) license.
 
 Permission to use, copy, modify, and/or distribute this software for any purpose
 with or without fee is hereby granted.

README.md

@@ -103,3 +103,9 @@ manually start it:
 
     $ doas rcctl enable i2pd
     $ doas rcctl start i2pd
+
+
+## Licensing
+
+The content of this repository is provided under a 0BSD license. See the LICENSE
+file for more information.