Aster plot - similar to radar chart (see desc)

src/examples/aster_plot/README.md

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+# Aster Plot for Looker
+
+Aster plots are used to display two metrics per slice in a pie chart visualisation. Each pie slice has a length and width component. 
+
+The first measure, the *length*, represents the **score** of each slice, is the value extending from the centre of the pie outwards to the edge (*0* is the centre and the outer circle length is defaulted to max value of all scores).
+
+The second measure, the *width*, represents the **weight** of each slice, which gets used to arrive at a weighted mean score of the length scores in the centre. This score can also be overriden by entering a custom keyword search to use a row level value's length in place of the weighted mean score. See example below.
+
+This implementation for Looker was built based on the [Ben Best’s Aster Plot in D3 Block](http://bl.ocks.org/bbest/2de0e25d4840c68f2db1).
+
+
+## Example
+![Screenshot](https://github.com/davidtamaki/aster_plot/blob/master/screen-shots/aster_example.gif)
+
+
+## Implementation Instructions
+1. Fork this repository
+
+2. Turn on [GitHub Pages](https://help.github.com/articles/configuring-a-publishing-source-for-github-pages/)
+
+3. Follow directions on Looker's documentation to add a [new custom visualisation manifest](https://docs.looker.com/admin-options/platform/visualizations#adding_a_new_custom_visualization_manifest):
+    - In the 'Main' field, the URI of the visualization will be `https://DOMAIN_NAME/aster_plot/aster_plot.js`. For example: https://davidtamaki.github.io/aster_plot/aster_plot.js
+    - The required dependencies are:
+      - [d3](https://d3js.org/d3.v3.min.js)
+      - [d3-tip](https://cdnjs.cloudflare.com/ajax/libs/d3-tip/0.9.1/d3-tip.min.js)
+