added pure html template + app with API (Core)

Core/.vs/Core/DesignTimeBuild/.dtbcache

Core/.vs/Core/v15/.suo

Core/.vs/Core/v15/Server/sqlite3/db.lock

Core/.vs/Core/v15/Server/sqlite3/storage.ide

Core/.vs/Core/v15/Server/sqlite3/storage.ide-shm

Core/.vs/Core/v15/Server/sqlite3/storage.ide-wal

Core/.vs/config/applicationhost.config

Core/Core.sln

Core/Core/.gitignore

Core/Core/ClientApp/.angular-cli.json

Core/Core/ClientApp/.editorconfig

Core/Core/ClientApp/.gitignore

Core/Core/ClientApp/README.md

Core/Core/ClientApp/e2e/app.e2e-spec.ts

Core/Core/ClientApp/e2e/app.po.ts

Core/Core/ClientApp/e2e/tsconfig.e2e.json

Core/Core/ClientApp/karma.conf.js

Core/Core/ClientApp/package-lock.json

Core/Core/ClientApp/package.json

Core/Core/ClientApp/protractor.conf.js