add bug issue template (#427)

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,48 @@
+---
+name: Bug report
+about: Create a report to help us improve
+
+---
+<!--
+# Is this issue related to a tool/package?
+If your issue is related to a tool or package, please report it at https://github.com/mandiant/VM-Packages/issues.
+
+# Have you checked that your issue isn't already filed?
+Please search if there is a similar issue at https://github.com/mandiant/flare-vm/issues. If there is already a similar issue, please add more details there instead of opening a new one.
+
+-->
+
+### Description
+
+<!-- Description of the issue -->
+
+### Steps to Reproduce
+
+<!-- 1. First Step -->
+<!-- 2. Second Step -->
+<!-- 3. and so on… -->
+
+**Expected behavior:**
+
+<!-- What you expect to happen -->
+
+**Actual behavior:**
+
+<!-- What actually happens -->
+
+### Environment
+
+<!--
+Please include details about your environment such as:
+**Run `VM-Get-Host-Info` and paste the output (assuming you have installed the `vm.common` package).**
+- host OS and virtualization software
+- VM OS version and service pack
+- VM OS ram and HDD space / usage
+- VM PowerShell version
+- VM Chocolatey version
+- VM Boxstarter version
+-->
+
+### Additional Information
+
+<!-- Any additional information, configuration or data that might be necessary to reproduce the issue. -->