Updates contributing instructions with refactoring guides. (#229)
Updates contributing instructions with refactoring guides. (#229)

* Updates contributing instructions with refactoring guides.

* Fixes formatting and code block highlights.

* Make a link.

* Comment about .NET tests.

* Remove duplicates section

* Update CONTRIBUTING.md

* Adds more refactoring guides.

* Removes outdated statement.

pivotal-jbarrett/geode-native,pivotal-jbarrett/geode-native,pivotal-jbarrett/geode-native,pivotal-jbarrett/geode-native,mmartell/geode-native,mmartell/geode-native,pivotal-jbarrett/geode-native,mmartell/geode-native,pivotal-jbarrett/geode-native,mmartell/geode-native,pivotal-jbarrett/geode-native,mmartell/geode-native