Add "About" section to README

Per issue https://github.com/vulcanize/vulcanizedb/issues/60 , adding description provided by @AFDudley on gitter here: https://gitter.im/vulcanizeio/VulcanizeDB?at=5b2a54b0148056028591b323
2018-06-20 15:55:33 -06:00 · 2018-06-20 15:55:33 -06:00 · febf412642
commit febf412642
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--- a/README.md
+++ b/README.md
@ -4,6 +4,10 @@

 [![Build Status](https://travis-ci.org/vulcanize/VulcanizeDB.svg?branch=master)](https://travis-ci.org/vulcanize/VulcanizeDB)

+## About
+
+Vulcanize DB is a set of tools that make it easier for developers to write application-specific indexes and caches for dapps built on Ethereum.
+
 ## Dependencies
 - Go 1.9+
 - Postgres 10