Add a blurb to the README

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-# SuperGood::SolidusTaxjar
+# SuperGood::SolidusTaxJar
+
+SuperGood::SolidusTaxJar is a [Solidus](https://github.com/solidusio/solidus) extension that allows Solidus stores to use [TaxJar](https://www.taxjar.com/) for tax calculations.
+
+This is not a fork of [spree_taxjar](https://github.com/vinsol-spree-contrib/spree_taxjar), like [solidus_taxjar](https://github.com/boomerdigital/solidus_taxjar). Instead, SuperGood::SolidusTaxJar uses the new configurable tax system [introduced by @adammathys](https://github.com/solidusio/solidus/pull/1892) in Solidus 2.4.
 
 ## Installation