adding fake data

docs/examples/fake-data.md

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+# Generating Fake Data 
+
+To work with MDS data, you may in fact, need to generate fake data for a variety of purposes. 
+
+To facililate that, *MDS Provider* has a `mds.fake` module that assists in the development of fake data. 
+
+## Examples
+
+To generate data, you'll need to setup a `ProviderDataGenerator`. 
+```python 
+from mds.fake.provider import ProviderDataGenerator
+
+
+gen = ProviderDataGenerator(
+        boundary=boundary,
+        speed=speed,
+        vehicle_types=args.vehicle_types,
+        propulsion_types=args.propulsion_types)
+
+```
+
+The above code creates a generator. To use that generator to make trips. The following example generates trips and status changes for 1 day, as definied by the variables. 
+
+```python 
+
+day_status_changes, day_trips = \
+gen.service_day(devices, date, hour_open, hour_closed, inactivity)
+```
+
+There are a number of options to help generate fake data. For example of the options in use, see the [mds-provider-services](https://github.com/CityofSantaMonica/mds-provider-services/blob/master/fake/main.py) repo.