Add CONTRIBUTING.md

Signed-off-by: Manuel Mendez <mmendez@equinix.com>

CONTRIBUTING.md

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+## Hello Contributors!
+
+Thanks for your interest!
+We're so glad you're here.
+
+### Important Resources
+
+#### bugs: [https://github.com/tinkerbell/sandbox/issues](https://github.com/tinkerbell/sandbox/issues)
+
+### Code of Conduct
+
+Please read and understand the code of conduct found [here](https://github.com/tinkerbell/.github/blob/master/CODE_OF_CONDUCT.md).
+
+### Environment Details
+
+Building is handled by `make`, please see the [Makefile](Makefile) for available targets.
+
+#### Nix
+
+This repo's build environment can be reproduced using `nix`.
+
+##### Install Nix
+
+Follow the [Nix installation](https://nixos.org/download.html) guide to setup Nix on your box.
+
+##### Load Dependencies
+
+Loading build dependencies is as simple as running `nix-shell` or using [lorri](https://github.com/nix-community/lorri).
+If you have `direnv` installed the included `.envrc` will make that step automatic.
+
+### How to Submit Change Requests
+
+Please submit change requests and / or features via [Issues](https://github.com/tinkerbell/sandbox/issues).
+There's no guarantee it'll be changed, but you never know until you try.
+We'll try to add comments as soon as possible, though.
+
+### How to Report a Bug
+
+Bugs are problems in code, in the functionality of an application or in its UI design; you can submit them through [Issues](https://github.com/tinkerbell/sandbox/issues).
+
+## Code Style Guides