for MPP-4172: add MPL license header to relay files

Author: groovecoder

components/relay/src/error.rs

@@ -1,3 +1,7 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
 pub type Result<T> = std::result::Result<T, Error>;
 
 #[derive(Debug, thiserror::Error)]

components/relay/src/lib.rs

@@ -1,3 +1,7 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
 mod error;
 
 pub use error::{Error, Result};

examples/relay-cli/src/main.rs

@@ -1,3 +1,7 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
 use clap::{Parser, Subcommand};
 use std::io::{self, Write};