Support mkr plugin install

.gitattributes

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+.gitattributes export-ignore
+script/ export-ignore
+.gitignore export-ignore
+*.png export-ignore

.gitignore

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+pkg-*/

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2015-2018 aereal
+
+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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-# mackerel-agent-plugins-osx
+# mackerel-plugin-macbook-battery-health
 
-**Unofficial** mackerel-agent plugins for Mac OS X.
+![preview](preview.png)
 
-## See Also
+## Requirements
 
-* [mackerelio]
-* [mackerel-agent]
-
-[mackerelio]: https://mackerel.io/
-[mackerel-agent]: https://github.com/mackerelio/mackerel-agent
+* Ruby (system)

script/release

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+#!/bin/bash
+
+set -e
+
+TAR="${TAR:-tar}"
+ref="$1" # HEAD or tag
+prefix_path="pkg"
+version="$(git describe --tags --always $ref)"
+
+echo "---> Create release for $version" >&2
+git archive --prefix "${prefix_path}-${version}/" --format=tar "$ref" | "$TAR" -C . -xf -