Add readme and license

LICENSE

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+MIT License
+
+Copyright (c) 2018 Hin Shun Edgar Lee
+
+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

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+genplugin
+---
+
+`genplugin` is a command-line tool to generate Docker plugins for testing.
+
+## Usage
+
+```
+$ docker run --rm -v /var/run/docker.sock:/var/run/docker.sock -e DOCKER_API_VERSION=1.36 hinshun/genplugin some/plugin
+$ docker plugin ls
+ID                  NAME                 DESCRIPTION         ENABLED
+1c9d60be44a4        some/plugin:latest                       false
+```