Add use cases folder
Add template for use-case model.
Update use-case template add example use-case.
Merge pull request #31 from SompongSoftwareEnterprise/move-use-case-to-github

Move use-cases to GitHub
Add login use-cases.
Remove whitespace from the "alternate flows" section of login UC.
Also remove whitespace from UC202 in addition to templates
Merge pull request #39 from SompongSoftwareEnterprise/login-srs

Use-Case Model for Login
Design login page with @erthh.