Bump junit from 4.12 to 4.13.1

Create maven.yml

Set theme jekyll-theme-leap-day

Update README.md

release 1.0

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Update README.md

scm release

[maven-release-plugin] prepare for next development iteration

[maven-release-plugin] prepare release java-maven-calculator-web-app-1.0

release prepare

Update README.md

Update README.md

add png

Update README.md