Include a README

README.md

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+# Timelion
+
+Timelion, pronounced *"timeline"*, brings together totally independent data
+sources into a single interface, driven by a simple, one-line expression
+language combining data retrieval, time series combination and transformation,
+plus visualization.
+
+To find out more, read this
+[blog post](https://www.elastic.co/blog/timelion-timeline) and watch this
+[video](https://www.youtube.com/watch?v=-sgZdW5k7eQ).