issue template

.github/ISSUE_TEMPLATE.md

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+<!--
+
+uMatrix is for advanced users. I do not provide support if you have issue
+using uMatrix.
+
+If you report an issue which I can't reproduce immediately, the issue will be
+closed as unreproducable.
+
+Given this, it's important to provide clear and detailed steps-to-reproduce.
+Please investigate fully and completely before opening an issue, you must make
+a strong and convincing case that the issue lies with uMatrix.
+
+("works when I turn off uMatrix" is NOT making the case).
+
+-->