add community template for LogTalk

Co-Authored-By: Paulo Moura <pmoura@logtalk.org>

community/Logtalk.gitignore

+# gitignore template for LogTalk, a programming language that builds upon Prolog
+# website: https://logtalk.org/
+
+# Logtalk temporary file directories
+.lgt_tmp/
+lgt_tmp/
+
+# Logtalk default unit testing and doclet results and logs directories
+logtalk_tester_logs/
+logtalk_doclet_logs/
+
+# backend Prolog compiler temporary files
+.pl-history
+*.out
+*.xwam
+*.qo
+*.ql
+*.itf
+*.po
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