add eiffel elicitation

.gitignore

config/eiffel.toml

files/.gitkeep

src/app/eiffel/eiffel.go

src/app/eiffel/output.go

src/app/eiffel/parser.go

src/app/eiffel/service.go

src/app/eiffel/web.go

src/app/template/parser/parser.go

src/cmd/web/main.go

src/core/trans/trans.go

src/core/web/ui.go

templates/base/layout.go.html

templates/eiffel/_elicitation-template.go.html

templates/eiffel/_form-elicitation.go.html

templates/eiffel/_form-output-file.go.html

templates/eiffel/_output-dir-search-result.go.html

templates/eiffel/_output-file-search-result.go.html

templates/eiffel/elicitation-page.go.html

templates/home.go.html