Create LICENSE file (#26)

* Add MIT license file.
* Add MIT license badge to README

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2021 Simon Leigh
+
+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

@@ -552,6 +552,10 @@ access to the whoami service. This example ingress also shows the use of the
 annotation support that was added in Traefik 2.2 for these objects for things
 such as the entry point and tls configuration.
 
+## License
+
+[![MIT license]](https://lbesson.mit-license.org/)
+
 [001-crd.yaml]: ./001-crd.yaml
 [001-rbac.yaml]: ./001-rbac.yaml
 [001-tls-options.yaml]: ./001-tls-options.yaml
@@ -588,6 +592,7 @@ such as the entry point and tls configuration.
 [letsencrypt]: https://letsencrypt.org/
 [lint code base]:
   https://github.com/sleighzy/k3s-traefik-v2-kubernetes-crd/workflows/Lint%20Code%20Base/badge.svg
+[mit license]: https://img.shields.io/badge/License-MIT-blue.svg
 [persistent volume claims]:
   https://kubernetes.io/docs/concepts/storage/persistent-volumes/
 [prerequisites for certificate generation]: