ctucx.git: dns.nix

Add REUSE metadata for flake.nix and flake.lock

flake.nix is licensed under MIT like the rest of the project.
flake.lock is machine-generated and likely uncopyrightable, and
the REUSE spec [suggests][1] that such files can be tagged as
licensed under CC0 to make clear that no copyright applies to them.

[1]: https://reuse.software/faq/#uncopyrightable

diff --git a/LICENSES/CC0-1.0.txt b/LICENSES/CC0-1.0.txt
@@ -0,0 +1,121 @@
+Creative Commons Legal Code
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diff --git a/flake.lock.license b/flake.lock.license
@@ -0,0 +1,2 @@
+SPDX-FileCopyrightText: 2020 Kirill Elagin <kirelagin@gmail.com>
+SPDX-License-Identifier: CC0-1.0

diff --git a/flake.nix b/flake.nix
@@ -1,3 +1,6 @@
+# SPDX-FileCopyrightText: 2020 Kirill Elagin <kirelagin@gmail.com>
+#
+# SPDX-License-Identifier: MIT
 {
   description = "Nix DSL for defining DNS zones";