Added an Issue template for GitHub

Author: marknca

ISSUE_TEMPLATE

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+Thanks for taking the time to submit an issue. There's a couple of things that will make this easier for everyone involve. If you could please take the time to complete the list below, it's much appreciated.
+
+- [ ] I'm using Deep Security version ____
+
+- [ ] I'm using the latest version of this repo. If not, version _____
+
+- [ ] My Deep Security Manager has a self-signed or non-validating SSL certificate
+
+In addition, can you please fill in each of the remaining sections.
+
+## Expected behaviour 
+
+## Actual behaviour
+
+## Steps to reproduce the behaviour