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CONTRIBUTING.md

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+# Contributing to OASGraph
+
+This document lists the differences between the contribution guidelines for
+this repository and the general [**Contributing to LoopBack**](http://loopback.io/doc/en/contrib/index.html) guidelines.
+
+### Developer Certificate of Origin
+
+This repository uses a [Developer Certificate of Origin (DCO)](https://developercertificate.org/) instead of a
+[Contributor License Agreement](https://cla.strongloop.com/agreements/strongloop/loopback.io) like most other LoopBack repositories. DCO
+is an easier process to adhere to. [Full text of DCO](https://developercertificate.org/) can be found below, formatted
+for readability. 
+
+> 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.
+
+Contributors sign-off that they adhere to these requirements by adding a Signed-off-by line to commit messages.
+
+```
+This is my commit message
+
+Signed-off-by: Random J Developer <[email protected]>
+```
+
+Git even has a -s command line option to append this automatically to your commit message:
+
+```sh
+$ git commit -s -m 'This is my commit message'
+```
+
+#### Fixing Commit Messages
+
+If you've pushed a commit and forgot to sign it, fear not, you can sign it as follows:
+
+```
+git commit --amend -s
+```
+
+Modify the commit message (if desired) -- do not modify the `Signed-off-by` line. Exit edit mode (`esc` followed by `:x` and then `Enter`). 
+
+Now force-push the changes by running:
+```
+git push origin +[branch-name]
+```
+
+Refer to the [official documentation](https://help.github.com/articles/changing-a-commit-message/#amending-older-or-multiple-commit-messages) for modifying multiple commits or an example with screenshots.
+
+If all else fails, ask the LoopBack team for help :)
+