Update index.md

Author: ccbogel

docs/doc/en/index.md

@@ -35,6 +35,10 @@ Software releases are available from [Github](https://github.com/ccbogel/QualCod
 
 [:material-linux: QualCoder_3.8.2_Ubuntu](/latest-linux){ .md-button .md-button--primary }
 
+The in development code is available here:
+
+[https://github.com/ccbogel/QualCoder](https://github.com/ccbogel/QualCoder)
+
 ## Support QualCoder
 
 If you like QualCoder and found it useful for your work. Please leave a review on these sites, like [Saashub](https://www.saashub.com/qualcoder-alternatives) or [AlternativeTo](https://alternativeto.net/software/qualcoder).
@@ -47,6 +51,12 @@ It has taken many, many hours of work to create this software that is provided f
 
 QualCoder is written in python using Qt6 for the graphical interface. QualCoder has been used on Windows 11, macOS and various Linux distros: Ubuntu, Lubuntu, ZorinOS, Arch, Fedora.
 
+## Citation
+
+Curtain, C. Dröge, K. Missaghieh--Poncet, J. Salomón, L. (2025) QualCoder 3.82 [Computer software]. Retrieved from https://github.com/ccbogel/QualCoder/releases/tag/3.8.2
+
+Replace the version number (3.8.2) as needed fo rthe version you are using.
+
 ## License
 
 QualCoder is licensed under the LGPL v3 license.