Add wrapper script for invoking Runic.main

bin/runic

@@ -0,0 +1,13 @@
+#!/bin/sh
+
+# A simple driver script for invoking Runic's main function. Put this script
+# somewhere in PATH and make sure it is executable. The script expects Runic to
+# be installed in the `@runic` shared environment and julia to be available in
+# PATH. See installation instructions in the repository README for more
+# details.
+#
+# Repository: https://github.com/fredrikekre/Runic.jl
+# SPDX-License-Identifier: MIT
+
+export JULIA_LOAD_PATH="@runic"
+exec julia --startup-file=no -e 'using Runic; exit(Runic.main(ARGS))' -- "$@"