(#902) Add debug info to Contributing document

[corbob]

Description Of Changes

Add debugging information to contributing document and provide a script to help with the process.

Motivation and Context

Because Chocolatey GUI depends on the system installed Chocolatey, the Chocolatey.Lib package needs to be the same version that is installed. This isn't currently called out in the contributing documentation, nor do we provide an easy way to update.

Testing

I have used the provided script several times to update the Chocolatey.Lib version targeted while working on the 1.1.0 release.

Change Types Made

• [ ] Bug fix (non-breaking change)
• [x] Feature / Enhancement (non-breaking change)
• [ ] Breaking change (fix or feature that could cause existing functionality to change)
• [ ] PowerShell code changes.

Related Issue

Fixes #902

Change Checklist

• [ ] Requires a change to the documentation
• [x] Documentation has been updated
• [ ] Tests to cover my changes, have been added
• [ ] All new and existing tests passed.
• [ ] PowerShell v2 compatibility checked.

[gep13]

@corbob thanks for getting this added. I added a couple of small tweaks after taking this for a spin, but on the whole a great addition, thanks!