add release notes

Author: mbaluda

change_notes/2026-05-21-fix-fp-rule-5-13-4.md

@@ -0,0 +1,5 @@
+- `RULE-5-13-4` - `cpp/misra/unsigned-integer-literals-not-appropriately-suffixed`:
+  - Remove FPs in user-defined literals and tamplate instantiations.
+- `M2-13-3` - `cpp/autosar/missing-u-suffix`:
+  - Remove FPs in user-defined literals and tamplate instantiations.
+