Add dictionary controller specs and factories

spec/factories/part_of_speech.rb

@@ -0,0 +1,6 @@
+FactoryBot.define do
+  factory :part_of_speech do
+    sequence(:pos) { |n| "test-#{n.to_s}" }
+    definition { "test definition" }
+  end
+end

spec/factories/word.rb

@@ -0,0 +1,5 @@
+FactoryBot.define do
+  factory :word do
+    sequence(:word) { |n| "test-#{n.to_s}" }
+  end
+end