Add swagger documentation

app.py

doc/__init__.py

doc/swagger-ui/index.html

doc/swagger-ui/oauth2-redirect.html

static/coreferences/coreferences.txt

static/swagger/api_doc.yaml

static/swagger/favicon-16x16.png

static/swagger/favicon-32x32.png

static/swagger/swagger-ui-bundle.js

static/swagger/swagger-ui-bundle.js.map

static/swagger/swagger-ui-standalone-preset.js

static/swagger/swagger-ui-standalone-preset.js.map

static/swagger/swagger-ui.css

static/swagger/swagger-ui.css.map

static/swagger/swagger-ui.js

static/swagger/swagger-ui.js.map

static/wikidata/wikidata.txt

static/wikidata/wikidata_groundtruth.txt