Add parts of speech model and database ingest rake task

lib/tasks/database.rake

@@ -0,0 +1,21 @@
+namespace :database do
+  desc "TODO"
+  task ingest: :environment do
+    ingest_data
+  end
+
+end
+
+def ingest_data
+  if PartOfSpeech.count > 0
+    puts "Data already exists in table! Aborting."
+    return
+  end
+
+  parts_of_speech = JSON.parse(File.read('db/dataset_en/toki-partsofspeech.json'))
+
+  parts_of_speech.each do |pos|
+    PartOfSpeech.create(pos: pos['pos'], definition: pos['definition'])
+  end
+  puts "Ingest complete."
+end