Merge remote-tracking branch 'origin/main'

README.md

src/main/java/dao/Database.java

src/main/java/resources/CalculatorResource.java

src/main/webapp/app.html

target/classes/classpath.index

target/classes/dao/Database.class

target/classes/resources/CalculatorResource.class

target/test-classes/CalculatorResourceTest.class

target/test-classes/classpath.index