Add README

Author: mpraglowski

contrib/ruby_event_store-sequel/README.md

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+# RubyEventStore Sequel Event Repository
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+![RubyEventStore Sequel Event Repository](https://github.com/RailsEventStore/rails_event_store/workflows/ruby_event_store-sequel/badge.svg)
+
+A [sequel](https://sequel.jeremyevans.net) based implementation of events repository for [Ruby Event Store](https://github.com/RailsEventStore/rails_event_store). It is an alternative to the ActiveRecord `EventRepository` implementation used in `rails_event_store` gem.
+
+[Read the docs to get started.](http://railseventstore.org/docs/repository/)