Added new view, template, and form for the creation of notes/comments in gitlab. Tested and appears to work correctly.
- Create form utilizes username URL validation and passes user_identifier to results dict.
- On successful comment creation, user is redirected to a success view
- template has basic styling applied.
Also updated the issue-detail-view with a link to creating a new note.
Also updated the issue-search view with automatically generated links to comment creation views.