Add IP Policy guidance (#618)

* Add IP Policy guidance

The goal of this IP Policy guidance is to make it really simple for
projects to comply with the Foundation's IP Policy.

This document is non-exhaustive by design. It is meant to address
the most common scenarios, not every corner-case.

It is also opinionated: it favors community norms and best practices
in areas where the Foundation's IP Policy provides leeway to do so.

This document is based on prior work from CNCF, available here:
https://github.com/cncf/foundation/blob/master/copyright-notices.md,
an earlier pull request by @brianwarner, available here:
#414,
and community input.

Committer: Tobie Langel <tobie@unlockopen.com>

* Update DCO/CLA guidance

Signed-off-by: Brian Warner <brian@bdwarner.com>

* Fix syntax error

Signed-off-by: Brian Warner <brian@bdwarner.com>

* One more time, to satisfy the linter.

Signed-off-by: Brian Warner <brian@bdwarner.com>

* Apply suggestions from code review

Co-authored-by: Brian Warner <brian@bdwarner.com>

* Restructure DCO/CLA guidance.

* Update IP_POLICY_GUIDANCE.md

Co-authored-by: Sendil Kumar N <sendilkumarn@live.com>

* Update IP_POLICY_GUIDANCE.md

* Update IP_POLICY_GUIDANCE.md

* Update IP_POLICY_GUIDANCE.md

Co-authored-by: Brian Warner <brian@bdwarner.com>

* Update IP_POLICY_GUIDANCE.md

* Update IP_POLICY_GUIDANCE.md

* Update IP_POLICY_GUIDANCE.md

* Update IP_POLICY_GUIDANCE.md

Co-authored-by: Kris Borchers <kris.borchers@gmail.com>

* Update IP_POLICY_GUIDANCE.md

Co-authored-by: Kris Borchers <kris.borchers@gmail.com>

* Update IP_POLICY_GUIDANCE.md

Co-authored-by: Brian Warner <brian@bdwarner.com>
Co-authored-by: Sendil Kumar N <sendilkumarn@live.com>
Co-authored-by: Kris Borchers <kris.borchers@gmail.com>

IP_POLICY_GUIDANCE.md

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+# OpenJS Foundation IP Policy Guidance
+
+The purpose of this guide is to make it straightforward for projects
+to follow the [OpenJS Foundation IP Policy][IP Policy].
+
+Of course, the source of truth remains the [IP Policy][].
+
+If in doubt about anything related to IP after reading this document,
+first read the [IP Policy][], and then [ask for help](#getting-help).
+
+## Basic requirements
+
+There are four key requirements for all OpenJS Foundation projects:
+
+1. [Licensing](#1-licensing)
+2. [Copyright notices](#2-copyright-notices)
+3. Displaying the [standard website footer](#3-standard-website-footer) on the project's website
+4. [Adopting the DCO or a CLA](#4-adopting-the-dco-or-a-cla)
+
+### 1. Licensing
+
+Code may be licensed under:
+  * [Apache, Version 2.0](http://www.apache.org/licenses/LICENSE-2.0)
+  * [MIT](https://opensource.org/licenses/MIT)
+  * [2-Clause BSD](https://opensource.org/licenses/BSD-2-Clause)
+  * [3-Clause BSD](https://opensource.org/licenses/BSD-3-Clause)
+
+Documentation may be licensed under:
+  * [CC BY 4.0](http://creativecommons.org/licenses/by/4.0/)
+  * [MIT](https://opensource.org/licenses/MIT)
+
+If you need to use a license which isn't in the [IP Policy][], you will
+[need to obtain permission from the Board to do so](#obtaining-an-exemption-from-the-board).
+
+### 2. Copyright notices
+
+The recommendation is to use a general copyright statement
+of the following form (where XYZ is the project's name):
+
+- **Copyright The XYZ Authors.**
+- **Copyright The XYZ Contributors.**
+- **Copyright Contributors to the XYZ project.**
+
+By using this format, the project avoids having to deal with
+names of copyright holders, years or ranges of years,
+and variations on the (c) symbol.
+
+_Please note that you **must not** change or remove existing copyright lines
+unless you put them there **and** have the right to do so.
+If there are existing copyright lines
+add the recommended copyright statement below the existing copyright lines.
+You may however update copyright lines that say
+"JS Foundation" or "Node.js Foundation" to "OpenJS Foundation"
+as this simply reflects the merged status of the organizations._
+
+### 3. Standard website footer
+
+All project websites need to have a [standard website footer][].
+
+### 4. Adopting the DCO or a CLA
+
+Each project must adopt either the [Developer Certificate of Origin (DCO)][DCO]
+or a Contributor License Agreement (CLA).
+
+The Board has pre-approved an [Individual CLA (ICLA)][ICLA]
+and a [Corporate CLA (CCLA)][CCLA]
+which projects can adopt without any further review.
+
+If you need to use a different CLA, you will need to
+[obtaining an exemption from the board](#obtaining-an-exemption-from-the-board).
+
+We are preparing additional guidance documentation on how to implement the DCO or a CLA,
+what infrastructure the foundation provides to help with this,
+what steps maintainers need to make when merging pull requests,
+and how to fix common issues that arise when using either solution.
+
+To setup the CLA infrastructure until this additional documentation is ready,
+please [reach out to foundation staff](#getting-help).
+
+## Obtaining an exemption from the Board
+
+If your project requires an exemption from the [IP Policy][],
+you will need to obtain special permission from the Board.
+To do so, please [open an issue in the Cross Project Council repository](https://github.com/openjs-foundation/cross-project-council/issues/new?title=Board%20exemption%20request%20for),
+and assign or @-mention [@brianwarner](https://github.com/brianwarner) and 
+[your Project Represenatives](https://github.com/openjs-foundation/cross-project-council#impact-project-representatives) if your are an Impact project,
+the [Growth & At Large Project Representatives](https://github.com/openjs-foundation/cross-project-council#growth--at-large-project-representatives)  if your are a Growth or At Large project,
+or [your Champion](https://github.com/openjs-foundation/cross-project-council/blob/master/PROJECT_PROGRESSION.md#application-champion) if you are an Incubating project.
+
+## Getting help
+
+If you have a question about this policy or how to implement it, please reach out to [legal-questions@lists.openjsf.org](mailto:legal-questions@lists.openjsf.org).
+
+[IP Policy]: https://ip-policy.openjsf.org
+[DCO]: https://developercertificate.org
+[ICLA]: https://individual-cla.openjsf.org
+[CCLA]: https://corporate-cla.openjsf.org
+[standard website footer]: https://github.com/openjs-foundation/artwork#copyright-notices-for-project-website-footers