first pass of contributor docs

Rework of contributor docs to reflect actual flow
for both internal and external developers using
the PowerShell/PowerShell repo for the first time.
Includes updates to issue/PR guidelines, repo 101,
and CONTRIBUTING.md.

docs/dev-process/pull-request-rules.md

@@ -6,3 +6,15 @@ author:  Hemant
   > "some tests we can only run internally"
   >	exact timeline not need for Aug17
   >	Windows quality gates
+
+## Minimum gates (TODO)
+
+Our [pull request template][pr-template] includes the bare minimum requirements for a pull request to be accepted into PowerShell. This includes:
+* Writing tests
+* Writing documentation (where does thie one live already? is it where this guidance should exist all up?)
+* Our [code review process][code-review]
+* Repository maintainer sign-off, per our [governance model][governance]
+
+[pr-template]: ../.github/PULL_REQUEST_TEMPLATE.md
+[code-review]: code-review-guidelines.md
+[governance]: ../community/governance.md