Add archive notice and link to active development

Added notice about repository being archived and active development location.

Author: dial481

README.md

@@ -1,5 +1,7 @@
 # Allelix
 
+### **This repository has been archived.** Active development continues at [allelix/allelix](https://github.com/allelix/allelix).
+
 Open-source command-line toolkit for analyzing raw genotype files from consumer DNA testing services. Format-agnostic ingestion, database-agnostic annotation, offline-first.
 
 > **Status:** Production — six parser formats, four annotators (ClinVar +