Add CODEOWNERS as default reviewers

.github/CODEOWNERS

@@ -0,0 +1,18 @@
+# https://github.com/cskefu/cskefu/issues/758
+
+# defaults
+*       @cskefu/reviewers
+
+# Order is important; the last matching pattern takes the most
+# precedence. When someone opens a pull request that only
+# modifies JS files, only @js-owner and not the global
+# owner(s) will be requested for a review.
+*.js    @lecjy
+*.ts    @lecjy
+*.pug   @lecjy
+*.java  @lecjy
+*.sql   @lecjy
+pom.xml @lecjy
+
+docs/*  @SAMZONG
+README* @SAMZONG