Update issue templates

Add a Bug Report issue template to guide new issue submitters to provide all needed details with their bug reports, and to hopefully cut down on the bug tickets generated for general tech support questions that could be answered in Discord.

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,29 @@
+---
+name: Bug report
+about: Crashes or unintended behaviors arising from Omnifactory's mods, configurations,
+  or custom scripts
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+Note: if you need general tech support for things like server configuration, Discord is a better venue. Please open an issue only if there is a clear bug with the pack or if you have been asked to by one of the Discord staff.
+
+**Pack Version:**
+Replace this text with the version number of the pack, or the commit hash (the letters and numbers between "dev-" and "-snapshot" in the zip you downloaded) if you are doing development testing. If you added any additional mods, or changed any configurations from their defaults, please also note that information here.
+
+**Description:**
+Replace this text with a clear and concise description of what the bug is, so we know what the problem is.
+
+**Expected Behavior:**
+Replace this text with a clear and concise description of what the correct behavior would be.
+
+**Steps To Reproduce:**
+Replace this text with steps to reproduce the behavior, if applicable. We need to know how to encounter this bug ourselves to we can diagnose it.
+
+**Crash Log:**
+If your client crashed as a result of this bug, please upload the generated crash log. This is found in your launcher's Omnifactory profile (aka instance) in a folder called `crash-reports`. If there was no crash, but instead an error screen, please upload your `latest.log` instead.
+
+**Screenshots:**
+If applicable, add screenshots to help explain your problem.