Add dropbox for keywords on left sidebar
Add the keyword that was selected from the dropbox to the idea in question
Add checkmark to the keywords in dropbox that are already attached to idea and prevent adding a keyword twice
Update README.md
Add dropbox to sidebar where a Keyword can be added to an Idea

Keyword cannot be added if the Idea already has it. Test was modified to test only the keyword present in the list not in the dropbox. Does not have issue yet and does not resolve the task.
Merge branch 'dropdown' into development

Add dropbox to ideas/1 page from where a new keyword can be added to the Idea
Add dropbox from where a Keyword can be attached to an Idea

Keyword cannot be added if Idea already has it.
Merge pull request #43 from hwikgren/development

Add dropbox from where a Keyword can be added to an Idea
Update README.md
Merge pull request #42 from satukark/patch-1

Update README.md