chore: add license headers (#384)

* feat: check for license headers

* add headers

* format

plugins/shell/src/commands.rs

@@ -1,3 +1,7 @@
+// Copyright 2019-2023 Tauri Programme within The Commons Conservancy
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-License-Identifier: MIT
+
 use std::{collections::HashMap, path::PathBuf, string::FromUtf8Error};
 
 use encoding_rs::Encoding;

plugins/shell/src/config.rs

@@ -1,3 +1,7 @@
+// Copyright 2019-2023 Tauri Programme within The Commons Conservancy
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-License-Identifier: MIT
+
 use std::path::PathBuf;
 
 use serde::{de::Error as DeError, Deserialize, Deserializer};

plugins/shell/src/error.rs

@@ -1,3 +1,7 @@
+// Copyright 2019-2023 Tauri Programme within The Commons Conservancy
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-License-Identifier: MIT
+
 use std::path::PathBuf;
 
 use serde::{Serialize, Serializer};

plugins/shell/src/lib.rs

@@ -1,3 +1,7 @@
+// Copyright 2019-2023 Tauri Programme within The Commons Conservancy
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-License-Identifier: MIT
+
 use std::{
     collections::HashMap,
     sync::{Arc, Mutex},