Add issue_template.md for GitHub issues
Add issue_template.md for GitHub issues

Change-Id: I4bbfa1bfdcd7cc5682df3128833040fe140ae3e9
Reviewed-on: https://gerrit.instructure.com/72351
Reviewed-by: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>
Tested-by: Jenkins
Product-Review: Clay Diffrient <9dff2e5c98626d20d2848250c411e8009465bb87@instructure.com>
QA-Review: Clay Diffrient <9dff2e5c98626d20d2848250c411e8009465bb87@instructure.com>

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