an initial take on checklist contribution

docs/checklist/_contributors.md

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+# Contributing to Checklists
+
+## Recommend structure
+An item in a checklist should include these elements:
+1. A concise actionable statement.
+2. An explanation of why the statement is relevant to the domain of the checklist.
+3. A recommendation for how to address the statement.
+4. A list of additional related resources.
+
+## Example
+
+``` markdown
+### Ensure that all checklist items are consistent
+
+A consistent structure helps readers better navigate the guidance. By applying these rules to all checklist items we maintain a higher level of quality. The standard structure makes it easier for others to contribute.
+
+_We recommend using the standard format for all checklist items. If an item doesn't fit the structure, exceptions should be discussed and approved by the content development team._
+
+* [The Checklist Manifesto](http://atulgawande.com/book/the-checklist-manifesto/) by Atul Gawande
+* [Design Review Checklists](../index.md)
+```