REUSE compliance [1/*]

Resolve license and copyright issues for all files other than the "app/" module

Signed-off-by: Aayush Gupta <aayushgupta219@gmail.com>

app/proguard-rules.pro

@@ -1,3 +1,9 @@
+#
+# SPDX-FileCopyrightText: 2021-2025 Rahul Kumar Patel <whyorean@gmail.com>
+# SPDX-FileCopyrightText: 2023-2025 The Calyx Institute
+# SPDX-License-Identifier: GPL-3.0-or-later
+#
+
 # Add project specific ProGuard rules here.
 # You can control the set of applied configuration files using the
 # proguardFiles setting in build.gradle.kts.
@@ -129,4 +135,4 @@
 -keep class com.huawei.** { *; }
 -dontwarn com.huawei.**
 -keep class com.hihonor.** { *; }
--dontwarn com.hihonor.**
+-dontwarn com.hihonor.**