Update CONTRIBUTING.md

Tweaking a little bit for fresh eyes plus adding related language from the README work I've been doing today. cc @channemann @scottleibrand @bewest

Author: danamlewis

CONTRIBUTING.md

@@ -2,8 +2,38 @@
 # Contributing to openaps
 
 Thanks for being a part of openaps.
+
+OpenAPS is a series of tools to support a self-driven DIY
+implementation based on the OpenAPS reference design. The tools may be
+categorized as *monitor* (collecting data about environment, and
+operational status of devices and/or aggregating as much data as is
+relevant into one place), *predict* (make predictions about what should
+happen next), or *control* (enacting changes, and feeding more data back
+into the *monitor*). 
+
+By proceeding using these tools or any piece within, you agree to the
+copyright (see LICENSE.txt for more information) and release any
+contributors from liability. 
+
+*Note:* This is intended to be a set of tools to support a self-driven DIY
+implementation and any person choosing to use these tools is solely
+responsible for testing and implement these tools independently or
+together as a system.  The [DIY part of OpenAPS is important]
+(http://bit.ly/1NBbZtO). While formal training or experience as an
+engineer or a developer is not required, what *is* required is a growth
+mindset to learn what are essentially "building blocks" to implement an
+OpenAPS instance. This is not a "set and forget" system; it requires
+diligent and consistent testing and monitoring to ensure each piece of
+the system is monitoring, predicting, and performing as desired.  The
+performance and quality of your system lies solely with you.
+
+Additionally, this community of contributors believes in "paying it
+forward", and individuals who are implementing these tools are asked to
+contribute by asking questions, helping improve documentation, and
+contribute in other ways.
+
 Please submit issues and pull requests so that all users can share
-knowledge.
+knowledge. If you're unfamiliar with GitHub and/or coding, [check out these other ways to get involved with OpenAPS.](https://openaps.gitbooks.io/building-an-open-artificial-pancreas-system/content/docs/Overview/contribute.html)
 
 For hacking on openaps, here are some tips to help your patches reach
 more people more quickly.  The `master` branch is special, it should
@@ -21,10 +51,5 @@ Here's few guidelines that might help:
   * Avoid editing `master` branch.
   * test changes
 
-That's it for now, thanks again!
-After several successful pull requests, @bewest, @openaps and others
-might add you as contributor so you can create shared branches more
-easily.
-
 See [OpenAPS.org](http://OpenAPS.org/) for background on the OpenAPS movement and project.