Change reports/README to Markdown

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Author: BigBlueHat

reports/README

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+This is a collection of individual
+[EARL reports](https://www.w3.org/TR/EARL10-Schema/) for
+test subjects claiming JSON-LD processor conformance.
+
+The consolidated report is saved to `index.html` generated
+using the
+[earl-report Ruby gem](https://rubygems.org/gems/earl-report).
+Run it as follows:
+
+```sh
+$ gem install earl-report
+$ earl-report --format json -o earl.jsonld *.ttl
+$ earl-report --json --format html --template template.haml -o index.html earl.jsonld
+```