Implement blackbox in Golang (#250)

* Initial release

docs/README.md

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+BlackBox
+========
+
+Blackbox is an open source tool that enables you to safe store sensitive information in
+Git (or other) repos by encrypting them with GPG.  Only the encrypted
+version of the file is available.  You can be free to provide access
+to the repo, as but only people with the right GPG keys can access the
+encrypted data.
+
+Things you should **never** store in a repo without encryption:
+
+* TLS (SSL) certificates
+* Passwords
+* API keys
+* And more!
+
+Project Info:
+
+* [Overview](user-overview.md)
+* [Why is this important?](why-is-this-important.md)
+* [Support/Community](support.md)
+* [How BB encrypts](encryption.md)
+* [OS Compatibility](compatibility.md)
+* [Installation Instructions](installation.md)
+* [Alternatives](alternatives.md)
+
+User Info:
+
+* [Enabling Blackbox on a Repo](enable-repo.md)
+* [Enroll a file](enable-repo.md)
+* [Full Command List](full-command-list.md)
+* [Add/Remove users](admin-ops.md)
+* [Add/Remove files](file-ops.md)
+* [Advanced techiques](advanced.md)
+* [Use with Role Accounts](role-accounts.md)
+* [Backwards Compatibility](backwards-compatibility.md)
+* [Replacing expired keys](expired-keys.md)
+* [Git Tips](git-tips.md)
+* [SubVersion Tips](subversion-tips.md)
+* [GnuPG tips](gnupg-tips.md)
+* [Use with Ansible](with-ansible.md)
+* [Use with Puppet](with-puppet.md)
+
+For contributors:
+
+* [Developer Info](dev.md)
+* [Code overview](dev-code-overview.md)
+* [HOWTO: Add new OS support](dev-add-os-support.md)
+* [HOWTO: Add new VCS support](dev-add-vcs-support.md)
+
+
+A slide presentation about an older release [is on SlideShare](http://www.slideshare.net/TomLimoncelli/the-blackbox-project-sfae).
+
+Join our mailing list: [https://groups.google.com/d/forum/blackbox-project](https://groups.google.com/d/forum/blackbox-project)
+
+
+License
+=======
+
+This content is released under the MIT License.
+See the [LICENSE.txt](LICENSE.txt) file.