Add missing hidden files

.github/CONTRIBUTING.md

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+# Contributing to WPScan
+
+## Licensing
+
+By submitting code contributions to the WPScan development team via Github Pull Requests, or any other method, it is understood that the contributor is offering the WPScan company (company number 	83421476900012), which is registered in France, the unlimited, non-exclusive right to reuse, modify, and relicense the code.

.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) [ ]

.github/PULL_REQUEST_TEMPLATE.md

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+## Licensing
+
+By submitting code contributions to the WPScan development team via Github Pull Requests, or any other method, it is understood that the contributor is offering the WPScan company (company number 	83421476900012), which is registered in France, the unlimited, non-exclusive right to reuse, modify, and relicense the code.