Set package citation author to SR Rani

Author: s-rani1

CITATION.cff

@@ -5,7 +5,9 @@ version: "0.1.0"
 type: software
 license: "GPL-2.0-or-later"
 authors:
-  - name: "latrend-py contributors"
+  - family-names: "Rani"
+    given-names: "S R"
+    email: "s.rani@live.com"
 abstract: "Python port of the R package latrend for longitudinal trajectory clustering."
 keywords:
   - longitudinal