Add issue tracking bug reporting template.

.github/ISSUE_TEMPLATE/bug-report.md

@@ -0,0 +1,31 @@
+---
+name: Bug Report
+about: Bug reporting for pktd/pktwallet/pktctl
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+* When submitting a bug report, please provide a brief description of your build environment, and attach the output of:
+  * `go version`
+  * `go env`
+  * `git describe --tags --always --abbrev=40`
+  * `git status -s -b`
+
+* macOS X users should attach the output of:
+  * `uname -a`
+  * `sw_vers`
+  * `system_profiler -detailLevel mini`
+  * `serverinfo --plist`
+
+* Linux users should attach the output of:
+  * `uname -a`
+  * `cat /etc/*elease`
+  * `lsb_release -a`.
+
+* Windows users should attach the *PowerShell* output of:
+  * `Get-CimInstance Win32_OperatingSystem | FL * | ?{$_ -notmatch 'SerialNumber'}`
+
+* Users of all POSIX environments (*including* OS X, WSL/WSL2, Linux, other UNIX systems, etc.) should attach the output of:
+  * `command -p getconf -a`.