📝 Added sandbox (code sketchbook)

sandbox/foo.pl

@@ -0,0 +1,13 @@
+# a basic example of how to write a standard input output shell in perl, it invokes system library's shell to write shell commands when invoked
+# to invoke: perl foo.pl
+
+use strict;
+use warnings;
+# my $string = "shell:"
+# print "$string\n";
+
+while(<>) {
+    system($_);
+}
+
+exit 0;