adds support request template

.github/ISSUE_TEMPLATE/support_request.md

@@ -0,0 +1,24 @@
+---
+name: Support request
+about: Help with running UMI-tools
+title: ''
+labels: ''
+assignees: ''
+
+---
+:warning: :warning: :warning:
+**Often you can get help more quickly from existing online material. Before you raise an issue to request help with running UMI-tools, please refer to:**
+
+- [Frequently asked questions](https://umi-tools.readthedocs.io/en/latest/faq.html)
+- [Documentation](https://umi-tools.readthedocs.io/en/latest/)
+- Search within the existing [open/closed issues](https://github.com/CGATOxford/UMI-tools/issues?q=is%3Aissue)
+- [Biostars](https://www.biostars.org/post/search/?query=umi_tools) 
+- Web search engine
+
+
+If the above links don't provide the information/advice required, please consider posting on [Biostars](https://www.biostars.org/new/post/). You're likely to get a response just as quick and your question will be visible to a larger community who can help and/or benefit from the post
+
+If you believe the support request is best made via a github issue, please delete this text and go ahead :smile:
+
+
+