Add missing SPDX license headers

Author: ltoenning

README.md

@@ -1,3 +1,8 @@
+<!--
+    SPDX-FileCopyrightText: Copyright (C) swift Project Community / Contributors
+    SPDX-License-Identifier: GFDL-1.3-only
+-->
+
 # Documentation for swift pilot client
 
 This repository contains documentation for the [swift pilot client](https://github.com/swift-project/pilotclient).

docs/home/contact.md

@@ -1,3 +1,8 @@
+<!--
+    SPDX-FileCopyrightText: Copyright (C) swift Project Community / Contributors
+    SPDX-License-Identifier: GFDL-1.3-only
+-->
+
 - Our primary communication platform is our :simple-discord: **Discord server**.
   If you want to contact us for support or to contribute, click on this **[invitation link](https://discord.gg/R7Atd9A)** and say hello!
 - Otherwise we will also support you on the official **[VATSIM Forums](https://forums.vatsim.net/forum/347-swift/)**.