Add SDL6 from kthakore++

Author: Tadeusz Sośnierz

META.list

@@ -67,6 +67,7 @@ https://github.com/bbkr/jsonrpc/raw/master/META.info
 https://github.com/perlpilot/benchmark/raw/master/META.info
 https://github.com/ihrd/uri/raw/master/META.info
 https://github.com/leto/perl6-Algorithm-Soundex/raw/master/META.info
+https://raw.github.com/PerlGameDev/SDL6/master/META.info
 https://github.com/perl6/ecosystem/raw/master/SHELTER/gamebase/META.info
 https://github.com/perl6/ecosystem/raw/master/SHELTER/DBDI/META.info
 https://github.com/perl6/ecosystem/raw/master/SHELTER/lolsql/META.info