docs: init (#1224)

docs/4_building.md

@@ -0,0 +1,38 @@
+# 🛠️ Building from source
+
+This page will guide you through building ReVanced Manager from source.
+
+1. Download Java SDK 17 ([Azul JDK](https://www.azul.com/downloads/?version=java-17-lts&package=jdk#zulu) or [OpenJDK](https://jdk.java.net/java-se-ri/17)) and add it to path
+
+2. Clone the repository
+
+   ```sh
+   git clone https://github.com/revanced/revanced-manager.git && cd revanced-manager
+   ```
+
+3. Create a GitHub personal access token with the `read:packages` scope [here](https://github.com/settings/tokens/new?scopes=read:packages&description=ReVanced)
+
+4. Add your GitHub username and the token to `~/.gradle/gradle.properties`
+
+   ```properties
+   gpr.user = YourUsername
+   gpr.key = ghp_longrandomkey
+   ```
+
+5. Set the `sdk.dir` property in `local.properties` to your Android SDK location
+
+   ```properties
+   sdk.dir = /path/to/android/sdk
+   ```
+
+6. Build the APK
+
+   Debug:
+   ```sh
+   ./gradlew assembleDebug
+   ```
+
+   Release:
+   ```sh
+   ./gradlew assembleRelease -Psign
+   ```