Add note about unsupported repo

.github/ISSUE_TEMPLATE/issue_template.md

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+---
+name: Vagrant-AWS Bug Report
+about: For when vagrant-aws is not working as expected or you have encountered a bug
+
+---
+
+**Please note that this plugin is no longer supported by HashiCorp and does not
+have an official maintainer to handle your issue or bug report.**
+
+### 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.
+
+### Vagrant-AWS plugin version
+
+### 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)
+```
+
+Please note, if you are using Homestead or a different Vagrantfile format, we
+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
+- ...

README.md

@@ -1,4 +1,11 @@
 # Vagrant AWS Provider
+
+# Official Support
+
+**This plugin is no longer officially supported by HashiCorp, and is no longer maintained.
+It should only be used at your own risk, as the plugin may or may not work and is subject
+to breaking changes in future releases of Vagrant.**
+
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