added assignment description

README.md

@@ -1,2 +1,30 @@
-# test-assignment-datawrapper
+# Assignment
 
+## Datawrapper Test Project: Backend
+### Overview
+
+The project is to create a web service that takes screenshots of websites.
+
+The service should expose an API that a client can use to create a new
+screenshot request, with any given URL as a parameter.
+The web service should then return a status URL that the client can
+periodically call to receive updates on the status on its request.
+The web service should take a screenshot of the provided URL.
+Once the screenshot was taken, it should be possible for the client to retrieve it.
+The service should be designed in a scalable fashion, so that it can handle
+varying amounts of parallel requests in a stable and efficient fashion.
+
+The API notation can be defined as you see fit.
+
+### Technology stack
+
+* Server-side code should be written in JavaScript or TypeScript
+* It should be possible to run the application locally (ideally as a
+containerized application, but other technologies are allowed as well)
+* Any other tools, technologies or frameworks can be used at your discretion
+* A hosted version of the application to test is a plus, but not a must
+
+### Delivery
+
+The project should be delivered as a Github repository.
+It should be possible to run the service locally.