Add issue template

.github/issue_template.md

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+### Required information
+
+Host CPU:
+Host GPU:
+Guest GPU:
+Host Kernel version:
+Host QEMU version:
+
+Please describe what were you doing when the problem occured. If the Windows host application crashed please check for file named `looking-glass-host.dmp` and attach it to this bug report.
+
+**Reports that do no include this information will be ignored and closed**