Add missing hidden files

.github/ISSUE_TEMPLATE.md

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+### Subject of the issue
+Describe your issue here.
+
+### Your environment
+* Version of WPScan:
+* Version of Ruby:
+* Operating System (OS):
+
+### Steps to reproduce
+Tell us how to reproduce this issue.
+
+### Expected behavior
+Tell us what should happen.
+
+### Actual behavior
+Tell us what happens instead.
+
+### What have you already tried
+Tell us what you have already tried to do to fix the issue you are having.
+
+Things you have tried (where relevant):
+
+* Update WPScan to the latest version [ ]
+* Update Ruby to the latest version [ ]
+* Ensure you can reach the target site using cURL [ ]
+* Proxied WPScan through a HTTP proxy to view the raw traffic [ ]
+* Ensure you are using a supported Operating System (Linux and macOS) [ ]