add nederburg license

LICENSE-NEDERBURG

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2018 Appernetic
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

@@ -8,6 +8,18 @@ This project is developed and maintained by the [Resources team][team].
 
 This project is distributed under the following licenses:
 
+- [`css/main.css`] is a partial re-implementation (derivative work) of the
+  [NEDERBURG Hugo theme], which is licensed under the MIT License. A copy of the
+  NEDERBURG license can be found at [LICENSE-NEDERBURG].
+
+[`css/main.css`]: ./css/main.css
+[NEDERBURG Hugo theme]: https://github.com/appernetic/hugo-nederburg-theme
+[LICENSE-NEDERBURG]: ./LICENSE-NEDERBURG
+
+- [`css/reset.css`] is licensed under the MIT License.
+
+[`css/reset.css`]: ./css/reset.css
+
 - The code samples and free-standing Cargo projects contained within this
   directory are licensed under the terms of both the [MIT License] and the
   [Apache License v2.0].

css/main.css

@@ -1,4 +1,7 @@
-/* Style based on the NEDERBURG Hugo theme (https://themes.gohugo.io/hugo-nederburg-theme/) */
+/* A partial re-implementation (derivative work) of the NEDERBURG Hugo theme (https://themes.gohugo.io/hugo-nederburg-theme/) */
+/* NEDERBURG is licensed under the MIT License. A copy of its license can be found at: */
+/* - https://github.com/rust-embedded/showcase/blob/master/LICENSE-NEDERBURG */
+/* - https://github.com/appernetic/hugo-nederburg-theme/blob/master/LICENSE */
 
 html {
     background-color: #2f3360;