add entry to readme (run prepare)

README.md

@@ -158,6 +158,7 @@ Finding aids for textual and multimedia [primary sources](https://en.wikipedia.o
 - [MEMOBASE](http://www.memobase.ch/) - Provides access to audiovisual documents from Swiss memory institutions.
 - [Sammlung Schweizerischer Rechtsquellen online](https://www.ssrq-sds-fds.ch/projekte/ssrq-online/) - Retrodigitalisierte und digitale Editionseinheiten der Schweizerischen Rechtsquellen. Ediert wird rechtshistorisches Quellenmaterial vom Mittelalter bis in die Frühe Neuzeit (1798).
 - [Schweizerisches Wirtschaftsarchiv](https://ub.unibas.ch/de/historische-bestaende/wirtschaftsarchive/) - This collection comprises over 500 business archives from the period 1750 to the present day, with a focus on the Basel region.
+- [Sources Online](https://sources-online.org/index.html) - A platform for digital scholarly text editions, integrating TEI Publisher and IIIF in Switzerland.
 - [swisscollections](https://swisscollections.ch/) - Meta search engine for historical and modern collections in Swiss libraries and archives.
 - [timeSTAT Cubes](http://www.sfa-laboratory.ch/sr/cubestest/index.php) - The Federal Council reports to parliament on income and expenditure for the past years.
 - [transcriptiones](http://transcriptiones.ch) - Create, share and access transcriptions of historical manuscripts.