feat: build initial demo

gradle/convention/settings.gradle.kts

...nvention/src/main/kotlin/justjanne.android.app.gradle.kts

...tion/src/main/kotlin/justjanne.android.library.gradle.kts

...tion/src/main/kotlin/justjanne.android.signing.gradle.kts

gradle/convention/src/main/kotlin/justjanne.java.gradle.kts

...ntion/src/main/kotlin/justjanne.kotlin.android.gradle.kts

...le/convention/src/main/kotlin/justjanne.kotlin.gradle.kts

...vention/src/main/kotlin/justjanne.repositories.gradle.kts

gradle/libs.versions.toml

gradle/wrapper/gradle-wrapper.jar

gradle/wrapper/gradle-wrapper.properties

gradlew

gradlew.bat

lint.xml

settings.gradle.kts