new CHANGELOG for 2024.03

CHANGELOG

@@ -1,4 +1,11 @@
-Version 2023.12 (unreleased)
+Version 2024.03 (unreleased)
+  Friendica Core
+
+  Friendica Addons
+
+  Closed Issues
+
+Version 2023.12 (2023-12-24)
   Friendica Core
     Raised minimal PHP version to 7.4
     Updates to the translations AR, BG, CA, CS, DE, EN GB, EN US, EO, ES, ET, FI, FR, GD, HU, IS, IT, JA, NL, PL, RO, RU, SV