Add changelog entry for CNV and SV HTs (#189)

* add changelog entry for CNV and SV HTs

* add v4.1 to title

* update date

* change date

Author: ch-kr

content/changelog/2025-03-cnv-sv-hts.md

@@ -0,0 +1,19 @@
+---
+title: Release v4.1 CNV and SV browser tables
+date: 2025-04-18
+order: 1
+---
+
+We have released two Hail Tables underlying the browser display of the gnomAD v4.1 [copy number variant (CNV)](https://gnomad.broadinstitute.org/news/2023-11-v4-copy-number-variants/) and [structural variant (SV)](https://gnomad.broadinstitute.org/news/2023-11-v4-structural-variants/) data.
+
+<!-- end_excerpt -->
+
+**Two additional tables are now available:**
+We have released two new tables in addition to the three tables released [last summer](https://gnomad.broadinstitute.org/news/2024-08-release-gnomad-browser-tables/):
+
+- gnomAD v4.1 CNV Hail Table
+- gnomAD v4.1 SV Hail Table
+
+For more information about these tables, please refer to our [help text](http://gnomad.broadinstitute.org/help/v4-browser-hts) on the browser release tables. 
+
+To download these tables, visit our [downloads page](http://gnomad.broadinstitute.org/downloads#v4-browser-tables).