add license to keccak WS source

examples/keccak.ws

@@ -1,18 +1,18 @@
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+Keccak-256_implementation_in_whitespace    
+Copyright_(C)_2024_Victor_Oliva 
 
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+This_program_is_free_software:_you_can_redistribute_it_and/or_modify 
+it_under_the_terms_of_the_GNU_General_Public_License_as_published_by			    																															 
+the_Free_Software_Foundation,_either_version_3_of_the_License,_or 
+(at_your_option)_any_later_version.			 
+
+This_program_is_distributed_in_the_hope_that_it_will_be_useful, 
+but_WITHOUT_ANY_WARRANTY;_without_even_the_implied_warranty_of
+MERCHANTABILITY_or_FITNESS_FOR_A_PARTICULAR_PURPOSE.__See_the  	
+GNU_General_Public_License_for_more_details.   	
+
+You_should_have_received_a_copy_of_the_GNU_General_Public_License 		 
+along_with_this_program.__If_not,_see_<https://www.gnu.org/licenses/>.