Add completions

app/views/completions/_form.html.slim

@@ -0,0 +1,19 @@
+= form_with model: completion, url: url, method: method do |form|
+  .row.mb-3
+    .col
+      .form-floating
+        = form.text_field :time_seconds, autocomplete: "off", class: "form-control"
+        = form.label :time_seconds, class: "required"
+  .row.mb-3
+    .col
+      .form-floating
+        = form.select :contestant_id, @contestants.map { |contestant| [contestant.name, contestant.id] }, {}, class: "form-select"
+        = form.label :contestant_id
+  .row.mb-3
+    .col
+      .form-floating
+        = form.select :puzzle_id, @puzzles.map { |puzzle| ["#{puzzle.name} - #{puzzle.brand}", puzzle.id] }, {}, class: "form-select"
+        = form.label :puzzle_id
+  .row
+    .col
+      = form.submit submit_text, class: "btn btn-primary"

app/views/completions/edit.html.slim

@@ -0,0 +1 @@
+= render "form", contest: @contest, completion: @completion, submit_text: "Save", method: :patch, url: "/contests/#{@contest.id}/completions/#{@completion.id}"

app/views/completions/new.html.slim

@@ -0,0 +1 @@
+= render "form", completion: @completion, submit_text: "Create", method: :post, url: "/contests/#{@contest.id}/completions"