Add a page which displays user ratings

[kirjs]

At the end of each milestone there is a survey but we do not do anything with the results: https://codelab.fun/angular/typescript/end

They are in firebase under the 'ratings'

[NothingEverHappens]

Instead of having just a number for rating, e.g.

newMilestone: {
  good: 4,
  bad: 1
}

Store list of events e.g.

newMilestone: [
  {type: 'good', uid: uid, date: date},
  {type: 'bad', uid: uid, date: date}
  {type: 'good', uid: uid, date: date},
  {type: 'good', uid: uid, date: date},
  {type: 'good', uid: uid, date: date},
]

(uid comes from login service)