Add dataset request template

Author: christianversloot

.github/ISSUE_TEMPLATE/dataset_request.md

@@ -0,0 +1,20 @@
+---
+name: Dataset request
+about: Add a particular dataset to the repository
+title: ''
+labels: dataset
+assignees: christianversloot
+
+---
+
+**URL to dataset**
+Please add the URL to the dataset here.
+
+**Describe the dataset**
+Please describe the dataset in a few words and why we should add it.
+
+**Is the dataset publicly accessible?**
+_Only datasets that do not require a login whatsoever, and hence work out-of-the-box, can be added._
+
+**How is the dataset licensed?**
+_Only open-source datasets or proprietary datasets with public licenses can be added._