Add license and copyright information

This patch adds license and copyright information to all files to make
nitrokey-rs compliant with the REUSE practices [0].

[0] https://reuse.software/practices/2.0/

1 files changed, 3 insertions, 0 deletions

diff --git a/Cargo.toml b/Cargo.toml
index ceaa57d..696adfd 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,3 +1,6 @@
+# Copyright (C) 2019 Robin Krahl <robin.krahl@ireas.org>
+# SPDX-License-Identifier: MIT
+
 [package]
 name = "nitrokey"
 version = "0.3.4"