Initial <task-lists> element

Author: dgraham

.eslintrc.json

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+{
+  "extends": [
+    "plugin:github/es6",
+    "plugin:github/browser",
+    "plugin:github/flow"
+  ]
+}

.flowconfig

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+[ignore]
+
+[include]
+
+[libs]
+
+[options]
+
+[lints]

.gitignore

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+dist/
+node_modules/

LICENSE

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+Copyright (c) 2018 GitHub, Inc.
+
+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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+# <task-lists> element
+
+Drag and drop task list items.
+
+## Installation
+
+```
+$ npm install --save @github/task-lists-element
+```
+
+## Usage
+
+```js
+import '@github/task-lists-element'
+```
+
+```html
+<task-lists sortable>
+  <ul class="contains-task-list">
+    <li class="task-list-item">
+      <input type="checkbox" class="task-list-item-checkbox">
+      Hubot
+    </li>
+    <li class="task-list-item">
+      <input type="checkbox" class="task-list-item-checkbox">
+      Bender
+    </li>
+  </ul>
+
+  <ul class="contains-task-list">
+    <li class="task-list-item">
+      <input type="checkbox" class="task-list-item-checkbox">
+      BB-8
+    </li>
+    <li class="task-list-item">
+      <input type="checkbox" class="task-list-item-checkbox">
+      WALL-E
+    </li>
+  </ul>
+</task-lists>
+```
+
+## Events
+
+```js
+const list = document.querySelector('task-lists')
+
+list.addEventListener('task-lists:check', function(event) {
+  const {position, checked} = event.detail
+  console.log(position, checked)
+})
+
+list.addEventListener('task-lists:move', function(event) {
+  const {src, dst} = event.detail
+  console.log(src, dst)
+})
+```
+
+## Browser support
+
+- Chrome
+- Firefox
+- Safari 9+
+- Internet Explorer 11
+- Microsoft Edge
+
+## Development
+
+```
+npm install
+npm test
+```
+
+## License
+
+Distributed under the MIT license. See LICENSE for details.