adding ngram app

ngram/admin.py

+from django.contrib import admin
+
+# Register your models here.

ngram/models.py

+from django.db import models
+
+# Create your models here.

ngram/tests.py

+from django.test import TestCase
+
+# Create your tests here.

ngram/views.py

+from django.shortcuts import render
+
+# Create your views here.