Add Quartr provider configuration file (#790)

* Add Quartr provider configuration file

* Add YAML document end marker in quartr.yml

* Fix indentation in quartr.yml configuration

* Update example_urls in quartr.yml for accuracy

* Fix URL scheme patterns in quartr.yml

Author: viktorlarsson

providers/quartr.yml

@@ -0,0 +1,13 @@
+---
+- provider_name: Quartr
+  provider_url: http://quartr.com
+  endpoints:
+  - schemes:
+    - https://quartr.com/*
+    - https://web.quartr.com/*
+    url: https://web.quartr.com/api/oembed
+    discovery: true
+    example_urls:
+    - https://web.quartr.com/api/oembed?url=https%3A%2F%2Fweb.quartr.com%2Fcompanies%2F3706%2Fevents%2F215125%2F&format=xml
+    - https://web.quartr.com/api/oembed?url=https%3A%2F%2Fweb.quartr.com%2Fcompanies%2F3706%2Fevents%2F215125%2F&format=json
+...