Update README.md

README.md

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 This is a repo for processing work on Digital Mitford letter TEI files. 
 It also contains versioning work on Our Village sketches.
 Previously, letters processing has been handled in the DM_processing repo, but starting May 2019 we're separating this work into its own repo to help make the processing more efficient and easier to share with the project team.
+
+## Versioning transformations 
+We're experimenting with transforming TEI critical apparatus markup together with other manuscript and prosopography markup into HTML with our customized project XSLT. 
+
+Here is the HTML output some transformations:
+* [1815-04-03: MRM to Sir William Elford](AppCrit-1815-04-03_Elford/1815-04-03_Elford_ac.html)
+