Add license information to Compiler Annotations for C and C++

Signed-off-by: Thomas Nyman <thomas.nyman@ericsson.com>

Author: thomasnyman

docs/Compiler-Hardening-Guides/Compiler-Annotations-for-C-and-C++.md

@@ -341,4 +341,8 @@ void do_with_untrusted_input(int untrusted_input) __attribute__ ((tainted_args))
 [^gcc-tainted-args]: GCC team, [Using the GNU Compiler Collection (GCC): 6.35.1 Common Function Attributes: tainted_args](https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-tainted_005fargs-function-attribute), GCC Manual, 2025-08-08.
 [^Malcolm23]: Malcolm, David. [Enable "taint" state machine with -fanalyzer without requiring -fanalyzer-checker=taint](https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103533#c9), GCC Bug 103533, 2023-12-01.
 
+## License
+
+Copyright 2024, OpenSSF contributors, licensed under [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/)
+
 ## References