Create severe_bug_report.md

added a new sever bug report for very bad bugs.

.github/ISSUE_TEMPLATE/severe_bug_report.md

@@ -0,0 +1,30 @@
+---
+name: Severe Bug Report
+about: Create a report of a severe bug, which causes a game crash, freeze, or loss of save data
+title: ''
+labels: 'severe bug'
+assignees: ''
+
+---
+
+#### Version of the game
+ - Version [e.g. v0.13.0]
+ - If applicable, commit id
+
+#### Original Hardware or Emulator?
+Specify target hardware or emulator where this bug happened.
+
+#### What is the bug?
+A clear and concise description of what the bug is.
+
+#### Steps to reproduce the behavior:
+1. In test chamber '…'
+2. Pick up '…'
+3. Shoot Portal '…'
+4. See error
+
+#### Screenshots
+If applicable, add screenshots to help explain your problem.
+
+#### Additional context
+Add any other context about the problem here.