added CONTRIBUTING and SECURITY md files in .github

.github/CONTRIBUTING.md

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+# Contributing to BeEF
+
+Anyone is welcome to make BeEF better!
+
+Below are the steps needed to add code to BeEF on Github to the master branch:
+
+1. Clone the repository and create a new branch
+
+2. Write and commit your new code to that branch
+
+3. Run the existing tests to make sure they pass
+
+See https://github.com/beefproject/beef/wiki/BeEF-Testing for steps to do so
+
+TL;DR: 
+```
+bundle install --with test
+bundle exec rake spec
+```
+
+4. Write tests in RSpec for your new code (module, extension etc.)
+
+5. Run all tests again to make sure they all pass
+
+6. Edit existing wiki page / add a new one explaining the new features, including:
+	- sample usage (command snippets, steps and/or screenshots)
+	- internal working (code snippets & explanation)
+
+7. Submit a Pull Request, explaining:
+	- what you have added
+	- where to find help about it (link to wiki page)
+

.github/SECURITY.md

@@ -0,0 +1,9 @@
+send security bug reports to security@beefproject.com
+
+**A security report should include:**
+
+1. Description of the problem (what it is, what's the impact)
+
+2. Technical steps to replicate it (commands / screenshots)
+
+3. Actionable fix/recommendations to mitigate the issue