Implement initial version of signing application

.eslintignore

.eslintrc.json

.gitignore

.gitlab/issue_templates/issue.md

.gitmodules

README.md

assets/.htaccess.ejs

assets/Makefile

assets/browser-check.js

assets/favicon.ico

assets/favicon.svg

assets/htaccess-shared

assets/icon-192.png

assets/icon-512.png

assets/logo.svg

assets/manifest.json

assets/silent-check-sso.html

assets/vpu-signature-pdf-upload.metadata.json

assets/vpu-signature-profile.metadata.json

assets/vpu-signature.html.ejs