Update index.md

Author: mariadeprez

index.md

@@ -13,6 +13,7 @@
 * [**Electromagnetic simulations**](emsims.html)
 * [**RF Field Mapping**](fieldmapping.html)
 * [**Fetal Cardiac MRI**](fetalcmr.html)
+* [**Fetal Slice-to-volume Reconstruction**](https://svrtk.github.io/)
 * [**Teaching Materials**](teaching.html)
 
 ### People