README.md in ndr_import-9.0.0 vs README.md in ndr_import-9.0.1

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-# NdrImport [![Build Status](https://travis-ci.org/PublicHealthEngland/ndr_import.svg?branch=master)](https://travis-ci.org/PublicHealthEngland/ndr_import) [![Gem Version](https://badge.fury.io/rb/ndr_import.svg)](https://badge.fury.io/rb/ndr_import)
+# NdrImport [![Build Status](https://travis-ci.org/PublicHealthEngland/ndr_import.svg?branch=master)](https://travis-ci.org/PublicHealthEngland/ndr_import) [![Gem Version](https://badge.fury.io/rb/ndr_import.svg)](https://badge.fury.io/rb/ndr_import) [![Documentation](https://img.shields.io/badge/ndr_import-docs-blue.svg)](https://www.rubydoc.info/gems/ndr_import)
 
 This is the Public Health England (PHE) National Disease Registers (NDR) Import ETL ruby gem, providing:
 
 1. file import handlers for *extracting* data from delimited files (csv, pipe, tab, thorn), .xls(x) spreadsheets, .doc(x) word documents, PDF, PDF AcroForms, XML, 7-Zip and Zip files.
 2. table mappers for *transforming* tabular and non-tabular data into key value pairs grouped by a common "klass".