Add LICENSE and README

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2014 Joseph Wynn
+
+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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+# Jekyll Responsive Images
+
+Jekyll Responsive Images is a [Jekyll](http://jekyllrb.com/) tag and utility for automatically resizing images. Its intended use is for sites which want to display responsive images using something like [`srcset`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/Img#Specifications) or [Imager.js](https://github.com/BBC-News/Imager.js/).
+
+[![Build Status](https://travis-ci.org/wildlyinaccurate/jekyll-responsive-images.svg?branch=master)](https://travis-ci.org/wildlyinaccurate/jekyll-responsive-images)
+[![Coverage Status](https://img.shields.io/coveralls/wildlyinaccurate/jekyll-responsive-images.svg)](https://coveralls.io/r/wildlyinaccurate/jekyll-responsive-images)
+[![Dependency Status](https://gemnasium.com/wildlyinaccurate/jekyll-responsive-images.svg)](https://gemnasium.com/wildlyinaccurate/jekyll-responsive-images)
+
+## Installation
+
+Install the gem yourself
+
+```
+$ gem install jekyll-responsive-image
+```
+
+Or simply add it to your Jekyll `_config.yml`:
+
+```yaml
+gems: [jekyll-responsive-image]
+```
+
+## Configuration
+
+An example configuration is below.
+
+```yaml
+responsive_image:
+  template: '_includes/responsive-image.html' # Path to the template to render. Required.
+
+  # An array of resize configurations. When this array is empty (or not specified),
+  # no resizing will take place.
+  sizes:
+    - width: 480 # How wide the resized image will be. Required
+    - width: 800
+      quality: 90 # JPEG quality. Optional.
+    - width: 1400
+```
+
+## Usage
+
+Replace your images with the `responsive_image` tag, specifying a path to the image.
+
+```
+{% responsive_image path: assets/my-file.jpg %}
+```
+
+Any extra attributes will be passed to the template.
+
+```
+{% responsive_image path: assets/image.jpg alt: "Lorem ipsum..." title: "Lorem ipsum..." %}
+```
+
+Create a template to suit your needs. A basic template example is below.
+
+```html
+<img src="/{{ path }}"
+     alt="{{ alt }}"
+     title="{{ title }}
+
+     {% if resized %}
+         srcset="{% for i in resized %}
+             /{{ i.path }} {{ i.width }}w{% if forloop.last == false %},{% endif %}
+         {% endfor %}"
+     {% endif %}
+>
+```