Implement initial version of signing application

assets/vpu-signature.topic.metadata.json

i18next-scanner.config.js

karma.conf.js

package-lock.json

package.json

rollup.config.js

scripts/vendor-update.sh

src/app/build-info.js

src/app/index.js

src/app/router.js

src/app/tugraz-logo.js

src/i18n.js

src/i18n/de/translation.json

src/i18n/en/translation.json

src/utils.js

src/vpu-signature-lit-element.js

src/vpu-signature-pdf-upload.js

src/vpu-signature-profile.js

src/vpu-signature.js

test/unit.js