feat: setup gradle project

.gitattributes

.gitignore

app/build.gradle

app/src/main/java/shoes/App.java

app/src/main/java/shoes/Boots.java

app/src/main/java/shoes/Box.java

app/src/main/java/shoes/BoxException.java

app/src/main/java/shoes/Shelf.java

app/src/main/java/shoes/ShoeBox.java

app/src/main/java/shoes/Shoes.java

app/src/main/java/shoes/Sneakers.java

gradle/libs.versions.toml

gradle/wrapper/gradle-wrapper.jar

gradle/wrapper/gradle-wrapper.properties

gradlew

gradlew.bat

settings.gradle