added Intellij-idea metadata to gitignore
added Intellij-idea metadata to gitignore

kanbanik/kanbanik,aymenhs/kanbanik,gudtago/kanbanik,nagyistoce/kanbanik,nagyistoce/kanbanik,mortenpoulsen/kanbanik,gudtago/kanbanik,mortenpoulsen/kanbanik,kanbanik/kanbanik,aymenhs/kanbanik