chore: add LICENSE file for tests (#539)

Author: snitin315

tests/fixtures/ecma-version/13/class-static-blocks/LICENSE

@@ -0,0 +1,28 @@
+The << Software identified by reference to the Ecma Standard* ("Software)">>  is protected by copyright and is being 
+made available under the  "BSD License", included below. This Software may be subject to third party rights (rights 
+from parties other than Ecma International), including patent rights, and no licenses under such third party rights 
+are granted under this license even if the third party concerned is a member of Ecma International.  SEE THE ECMA 
+CODE OF CONDUCT IN PATENT MATTERS AVAILABLE AT http://www.ecma-international.org/memento/codeofconduct.htm FOR 
+INFORMATION REGARDING THE LICENSING OF PATENT CLAIMS THAT ARE REQUIRED TO IMPLEMENT ECMA INTERNATIONAL STANDARDS*.
+
+Copyright (C) 2012-2013 Ecma International
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without modification, are permitted provided that the 
+following conditions are met:
+1.   Redistributions of source code must retain the above copyright notice, this list of conditions and the following 
+     disclaimer.
+2.   Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the 
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+
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+
+* Ecma International Standards hereafter means Ecma International Standards as well as Ecma Technical Reports