docs: license

THIRD_PARTY_NOTICES.md

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+# Third-party notices
+
+UNN HUB uses third-party software distributed under its own licenses. The GNU GPL
+license in [LICENSE](LICENSE) applies to code authored for UNN HUB; it does not
+replace or alter the licenses of third-party components listed below.
+
+## Components used by the application
+
+### AndroidX libraries
+
+- Artifacts: `androidx.*` (Core, SplashScreen, DataStore, Navigation, Room,
+  Lifecycle, Activity, Compose, Material 3, Paging, AndroidX Test, etc.)
+- Copyright: The Android Open Source Project and contributors
+- License: Apache-2.0
+- Source: https://android.googlesource.com/platform/frameworks/support/
+
+### Coil
+
+- Artifacts: `io.coil-kt.coil3:coil-compose`,
+  `io.coil-kt.coil3:coil-network-ktor3`
+- Copyright: Coil contributors
+- License: Apache-2.0
+- Source: https://github.com/coil-kt/coil
+
+### Ktor
+
+- Artifacts: `io.ktor:ktor-client-core`, `io.ktor:ktor-client-logging`,
+  `io.ktor:ktor-client-android`
+- Copyright: JetBrains s.r.o. and contributors
+- License: Apache-2.0
+- Source: https://github.com/ktorio/ktor
+
+### Splitties
+
+- Artifacts: `com.louiscad.splitties:splitties-fun-pack-android-base-with-views-dsl`,
+  `com.louiscad.splitties:splitties-arch-room`
+- Copyright: Louis CAD and contributors
+- License: Apache-2.0
+- Source: https://github.com/LouisCAD/Splitties
+
+### Sentry Android SDK
+
+- Artifact: `io.sentry:sentry-android`
+- Copyright: Sentry and contributors
+- License: MIT
+- Source: https://github.com/getsentry/sentry-java
+
+### desugar_jdk_libs
+
+- Artifact: `com.android.tools:desugar_jdk_libs`
+- Copyright: Google LLC, Oracle America, and other contributors as applicable
+- License: GPL-2.0-only WITH Classpath-exception-2.0
+- Source: https://github.com/google/desugar_jdk_libs
+
+## Build-time dependencies
+
+These tools are used to build the project and are not relicensed under UNN HUB's
+GPL license:
+
+- Gradle — Apache-2.0
+  - https://github.com/gradle/gradle
+- Android Gradle Plugin — Apache-2.0
+  - https://android.googlesource.com/platform/tools/base/
+- Kotlin Gradle and Compose plugins — Apache-2.0
+  - https://github.com/JetBrains/kotlin
+- Kotlin Symbol Processing (KSP) — Apache-2.0
+  - https://github.com/google/ksp
+- Sentry Android Gradle Plugin — MIT
+  - https://github.com/getsentry/sentry-android-gradle-plugin
+- Foojay Toolchains Resolver — Apache-2.0
+  - https://github.com/gradle/foojay-toolchains
+
+## License texts
+
+This file is an attribution and license index, not a replacement for the
+licenses themselves. Third-party components remain subject to their respective
+license terms and copyright notices.