Add config for cargo-deny

.deny.toml

@@ -0,0 +1,28 @@
+# SPDX-FileCopyrightText: The djio authors
+# SPDX-License-Identifier: CC0-1.0
+
+[advisories]
+db-path = "~/.cargo/advisory-db"
+db-urls = ["https://github.com/rustsec/advisory-db"]
+vulnerability = "deny"
+unmaintained = "warn"
+yanked = "warn"
+notice = "warn"
+
+[licenses]
+default = "deny"
+unlicensed = "deny"
+copyleft = "warn"
+allow = [
+    "Apache-2.0",
+    "MIT",
+    "MPL-2.0",
+    "Unicode-DFS-2016",
+]
+
+[bans]
+multiple-versions = "warn"
+wildcards = "allow"
+highlight = "all"
+workspace-default-features = "allow"
+external-default-features = "allow"