Added sample-project README.

sample_project/README.md

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+# Sample Project
+
+There's a sample project demonstrating the use of `django_importer` in
+a management command to import data from a CSV file to a django model.
+
+# Testing
+
+To manually test the command, go to the `sample_project` directory,
+open the shell and check the number of Tasks:
+
+    ./manage.py shell
+    >>> from tasks.models import Task
+    >>> Task.objects.count()
+    0
+
+Now run the import command using the sample CSV file and check the
+number of Tasks again:
+
+    ./manage.py tasks_import_daily tasks.csv
+    ./manage.py shell
+    >>> from tasks.models import Task
+    >>> Task.objects.count()
+    21
+