Adding new marshmallow-house directory

Please review this, @casey-collab

- Have finally fixed the relative path so it works!

I am so sorry, I am still bit confused with .git and GitHub.
- Forked and Cloned the create-your.. repository
- created change-story branch on local master and made it the current directory
- created marshmallow-house directory with directories and files in it
- added and committed the changes from change-story branch
- pushed the branch to origin
- found error on marshmallow-hous/marshy-house.md - followed the above two steps
- hopefully I am now not wasting your time.
It looks like there is no link to this new file.  Did you forget to commit that change?  Make sure you create (and commit) an option for each new "page" you create.