docs: init

docs/revanced-development/5_building_revanced_integrations.md

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+# Building the ReVanced Integrations
+
+1. Make sure `$ANDROID_SDK_ROOT` or `$ANDROID_HOME` is set correctly
+
+2. Clone the repository
+
+   ```bash
+   git clone https://github.com/revanced/revanced-integrations && cd revanced-integrations
+   ```
+
+3. Build the integrations
+
+   ```bash
+   ./gradlew build
+   ```
+
+The file will be located in `app/build/outputs/apk/release/app-release-unsigned.apk`
+
+## Next step
+
+[Building the ReVanced CLI](6_building_revanced_cli.md)