Add challenges section

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## Babson Group-Project Documents Would Benefit from Version Control
### Improve work flow
#### remove unnecessary email burden of attatched document files
#### no more confusion about which version is the most current & comprehensive
### Comfirm contribution distribution between group members
#### each group member's contribution is clearly delineated and timestamped
## Babson's Writers Would Benefit Individually from Version Control
### Engaging in The Version Control Process Supports the Babson Writing Curriculum's Pedagoical Goals
#### saving each change with a message explaining what was done and why is a repeated, small moment of meta-thinking about the intended purpose of an instance of writing
#### each save message pulls the writer briefly out of content-creation and takes her back to rhetorical structure
#### continually referencing the reasoning behind changes to a document gives the writer a structured time to reflect on whether the change accomplishes its goal
## Challenges
### Teaching non-programmers git version control concepts
### Teaching Markup
### Traction over google docs/word plus email/dropbox, which are more ubiquitous