Adding CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing Guidelines
+
+This document contains information and guidelines about contributing to this project.
+Please read it before you start participating.
+
+**Topics**
+
+* [Asking Questions](#asking-questions)
+* [Reporting Security Issues](#reporting-security-issues)
+* [Reporting Issues](#reporting-other-issues)
+* [Developers Certificate of Origin](#developers-certificate-of-origin)
+* [Code of Conduct](#code-of-conduct)
+
+## Asking Questions
+
+We don't use GitHub as a support forum.
+For any usage questions that are not specific to the project itself,
+please ask on [Stack Overflow](https://stackoverflow.com) instead.
+By doing so, you'll be more likely to quickly solve your problem,
+and you'll allow anyone else with the same question to find the answer.
+This also allows maintainers to focus on improving the project for others.
+
+## Reporting Security Issues
+
+The Alamofire Software Foundation takes security seriously.
+If you discover a security issue, please bring it to our attention right away!
+
+Please **DO NOT** file a public issue,
+instead send your report privately to <security@alamofire.org>.
+This will help ensure that any vulnerabilities that _are_ found
+can be [disclosed responsibly](http://en.wikipedia.org/wiki/Responsible_disclosure)
+to any affected parties.
+
+## Reporting Other Issues
+
+A great way to contribute to the project
+is to send a detailed issue when you encounter an problem.
+We always appreciate a well-written, thorough bug report.
+
+Check that the project issues database
+doesn't already include that problem or suggestion before submitting an issue.
+If you find a match, add a quick "+1" or "I have this problem too."
+Doing this helps prioritize the most common problems and requests.
+
+When reporting issues, please include the following:
+
+* The version of Xcode you're using
+* The version of iOS or OS X you're targeting
+* The full output of any stack trace or compiler error
+* A code snippet that reproduces the described behavior, if applicable
+* Any other details that would be useful in understanding the problem
+
+This information will help us review and fix your issue faster.
+
+## Developer's Certificate of Origin 1.1
+
+By making a contribution to this project, I certify that:
+
+- (a) The contribution was created in whole or in part by me and I
+      have the right to submit it under the open source license
+      indicated in the file; or
+
+- (b) The contribution is based upon previous work that, to the best
+      of my knowledge, is covered under an appropriate open source
+      license and I have the right under that license to submit that
+      work with modifications, whether created in whole or in part
+      by me, under the same open source license (unless I am
+      permitted to submit under a different license), as indicated
+      in the file; or
+
+- (c) The contribution was provided directly to me by some other
+      person who certified (a), (b) or (c) and I have not modified
+      it.
+
+- (d) I understand and agree that this project and the contribution
+      are public and that a record of the contribution (including all
+      personal information I submit with it, including my sign-off) is
+      maintained indefinitely and may be redistributed consistent with
+      this project or the open source license(s) involved.
+
+## Code of Conduct
+
+The Code of Conduct governs how we behave in public or in private
+whenever the project will be judged by our actions.
+We expect it to be honored by everyone who contributes to this project.
+
+See [CONDUCT.md](https://github.com/Alamofire/Foundation/CONDUCT.md) for details.
+
+---
+
+*Some of the ideas and wording for the statements above were based on work by the [Docker](https://github.com/docker/docker/blob/master/CONTRIBUTING.md) and [Linux](http://elinux.org/Developer_Certificate_Of_Origin) communities. We commend them for their efforts to facilitate collaboration in their projects.*