Add documentation link

Add documentation link

bugfix init connection string

Update app.go

Merge pull request #21 from eliona-smart-building-assistant/develop

init connection string

Update base images

Update metadata.json

add integration tests and CORS header

Merge pull request #14 from eliona-smart-building-assistant/eliona_ap…

…p_and_api

implement eliona_app changes and add API specification path