Documentation missing for V1 to V2 migration

[KishoreBarik]

While trying v1 to v2 migration, the android build was failing in preBuild step. As it couldn't find node_modules/react-native-reanimated/android/src/main/java/com/swmansion/reanimated/transitions/. When I checked this folder was not present indeed. After reinstalling react-native-reanimated few times. Still the issue persisted. After conforming from https://unpkg.com/browse/[email protected]/android/src/main/java/com/swmansion/reanimated/ I was sure those file don't belong to V2 anymore. So removed below code from app/build.gradle file preBuild.doFirst section, then android build was successful.

ant.replaceregexp(match: 'android.support.annotation.NonNull;', replace: 'androidx.annotation.NonNull;', flags: 'g', byline: true)
            {
                fileset(dir: '../../node_modules/react-native-reanimated/android/src/main/java/com/swmansion/reanimated/transitions/', includes: '*.java')
            }
    ant.replaceregexp(match: 'android.support.annotation.Nullable;', replace: 'androidx.annotation.Nullable;', flags: 'g', byline: true)
            {
                fileset(dir: '../../node_modules/react-native-reanimated/android/src/main/java/com/swmansion/reanimated/transitions/', includes: '*.java')
            }
    ant.replaceregexp(match: 'android.support.transition', replace: 'androidx.transition', flags: 'g', byline: true)
            {
                fileset(dir: '../../node_modules/react-native-reanimated/android/src/main/java/com/swmansion/reanimated/transitions/', includes: '*.java')
            }

        I think this should be documented.