README.md: Add link to releases and cleanup markdown

README.md

@@ -2,16 +2,18 @@
 This plugin checks a batch of authority records to identify unused authorities
 
 To install:
-Make sure plugins are enabled on your Koha
-system
-Go to More->Reports->Report Plugins
+Make sure plugins are enabled on your Koha system
+
+Download the most recent .kpz from the [koha-plugin-unused-authority-check release page](https://github.com/bywatersolutions/koha-plugin-unused-authority-check/releases)
+
+Go to `More->Reports->Report Plugins`
 Click 'Upload a plugin' and browse to the kpz file downloaded from the release page
 
 To use:
-1 - From the plugins page click 'Run report' for the Unused Authoirty Report
-2 - Enter a range of auhtority ids (record numbers) to check
-**Note - the plugin has a hardcoded limit of 5000 records and it is recommended to start with smaller batches
-3 - Choose to display results as HTML or download in a CSV
-4 - Run the report and view your results
+1. - From the plugins page click 'Run report' for the Unused Authoirty Report
+1. - Enter a range of auhtority ids (record numbers) to check, _or_ enter the creation date of the authority records.
+**Note - the plugin has a hardcoded limit of 5000 records**. It is recommended to start with smaller batches
+1. - Choose to display results as HTML or download in a CSV
+1. - Run the report and view your results