create initial guide for how to sign contributor agreement

root-systems/cobuy#77

guides/how-to-sign-contributor-agreement.md

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+# How to sign contributor agreement
+
+So you want to join as a Root Systems contributor? Great!
+
+## Why must I sign before contributing?
+
+In order to practice safe and hygenic open source, Root Systems Limited is the legal [kaitiaki](http://maoridictionary.co.nz/search?keywords=kaitiaki) of the intellectual property for projects under our umbrella.
+
+This means that in order for us to incorporate your significant contributions, we ask that you first sign an agreement that you:
+
+- are legally able to contribute your changes (with a disclaimer from your employer, if necessary)
+- are willing to assign the full copyright of your contribution to Root Systems Limited
+
+Small changes can be accepted without a copyright disclaimer or a copyright assignment on file.
+
+If a contributor is reluctant to sign a copyright assignment for a change, a copyright disclaimer to put the change in the public domain is acceptable as well. The copyright disclaimer form is different than an employer disclaimer form. A copyright assignment is more convenient if a contributor plans to make several separate contributions.
+
+This is a prerequisite in order for Root Systems to best act as steward for our open source projects.
+
+This does not mean the project loses any "open" from open source, you are still forever guaranteed the freedoms provided by the projects' licenses, including the ability to fork a project, make changes, and contribute these changes to others.
+
+## Guide
+
+Here's our step-by-step guide:
+
+- TODO
+
+## Background
+
+- ["Open Source: Theory of Operation"](https://oss.kemitchell.com/)
+- ["Producing OSS" Background on Copyright Assignment and Ownership](http://www.producingoss.com/en/copyright-assignment.html)
+- [_Why does the Free Software Foundation get copyright assignments from contributors_](https://www.gnu.org/licenses/why-assign.html)
+- [The Free Software Foundation on Legal Matters](https://www.gnu.org/prep/maintain/maintain.html#Legal-Matters)
+- [The core Copyright documents in FSF Projects](http://git.savannah.gnu.org/cgit/gnulib.git/tree/doc/Copyright)
+- ["The Next Generation of Contributor Agreements"](http://contributoragreements.org/about.html)