Add template for GitHub issues.

.github/ISSUE_TEMPLATE.md

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+<!--
+Hi, thank you for opening an issue!
+Before hitting the button...
+
+** Is this a REQUEST FOR HELP? **
+If so, please have a look at:
+- our FAQ: https://www.weave.works/docs/net/latest/faq/
+- our troubleshooting page: https://www.weave.works/docs/net/latest/troubleshooting/
+- our help page, to choose the best channel (Slack, etc.) to reach out: https://www.weave.works/help/
+
+** Is this a FEATURE REQUEST? **
+If so, please search existing feature requests, and if you find a similar one, up-vote it and/or add your comments to it instead.
+If you did not find a similar one, please describe in details:
+- why: your use-case, specific constraints you may have, etc.
+- what: the feature/behaviour/change you would like to see in Weave Net
+Do not hesitate, when appropriate, to share the exact commands or API you would like, and/or to share a diagram (e.g.: asciiflow.com): "a picture is worth a thousand words".
+
+** Is this a BUG REPORT? **
+If so, please search existing bug reports, and if you find a similar one, up-vote it and/or add your comments to it instead.
+If you did not find a similar one, please fill in as much of the template below as you can.
+If you leave out information, we will not be able to help you as well.
+
+In all cases, be ready for follow-up questions and please respond in a timely manner.
+If we cannot reproduce a bug or think a feature already exists, we might close your issue.
+If we are wrong, please feel free to reopen it and explain why.
+
+Thank you!
+-->
+
+## Environment:
+
+### Weave:
+```
+$ weave report
+```
+
+### Docker:
+```
+$ docker version
+$ docker-runc --version
+```
+
+### Kubernetes:
+```
+$ kubectl version
+```
+
+### Logs:
+<!-- Anything interesting or unusual output by the below, potentially relevant, commands? -->
+<!-- (If output is long, please consider a Gist.) -->
+```
+$ docker logs weave
+$ journalctl -u docker.service --no-pager
+$ kubectl logs -n kube-system <weave-net-pod> weave
+$ kubectl get events
+```
+
+### OS:
+```
+$ uname -a
+$ cat /etc/*release*
+```
+
+### Network:
+```
+$ ip route
+$ ip -4 -o addr
+```
+<!-- Anything interesting or unusual output by iptables-save? -->
+<!-- (If output is long, please consider a Gist.) -->
+
+## What you expected to happen?
+
+## What happened?
+<!-- Error message, actual behaviour, etc. -->
+
+## How to reproduce it?
+<!-- Specific steps, as minimally and precisely as possible. -->
+
+## Anything else we need to know?
+<!-- Cloud provider? Hardware? How did you configure your cluster? Kubernetes YAML, KOPS, etc. -->