Add bug report template for Vagrant GitHub issues

.github/ISSUE_TEMPLATE/bug-report.md

@@ -1,19 +1,29 @@
+---
+name: Vagrant Bug Report
+about: For when Vagrant is not working as expected or you have encountered a bug
+
+---
+
 Please note that the Vagrant issue tracker is in priority reserved for bug reports and enhancements. For general usage questions, please use
 HashiCorp Discuss: https://discuss.hashicorp.com/c/vagrant/24 Thank you!
 
 **Tip:** Before submitting your issue, don't hesitate to remove the above introductory text, possible empty sections (e.g. References), and this tip.
 
 ### Vagrant version
+
 Run `vagrant -v` to show the version. If you are not running the latest version
 of Vagrant, please upgrade before submitting an issue.
 
 ### Host operating system
+
 This is the operating system that you run locally.
 
 ### Guest operating system
+
 This is the operating system you run in the virtual machine.
 
 ### Vagrantfile
+
 ```ruby
 # Copy-paste your Vagrantfile here (but don't include sensitive information such as passwords, authentication tokens, or email addresses)
 ```
@@ -23,23 +33,28 @@ may be unable to assist with your issue. Try to reproduce the issue using a
 vanilla Vagrantfile first.
 
 ### Debug output
+
 Provide a link to a GitHub Gist containing the complete debug output:
 https://www.vagrantup.com/docs/other/debugging.html. The debug output should
 be very long. Do NOT paste the debug output in the issue, just paste the
 link to the Gist.
 
 ### Expected behavior
+
 What should have happened?
 
 ### Actual behavior
+
 What actually happened?
 
 ### Steps to reproduce
+
 1.
 2.
 3.
 
 ### References
+
 Are there any other GitHub issues (open or closed) that should be linked here?
 For example:
 - GH-1234