Merge pull request #3 from jchannon/readme

Add initial README

Author: alexeyzimarev

README.md

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+# Bookings Sample Application
+
+This projects shows some of the features of Eventuous
+
+//TODO
+Describe features used
+
+## Usage
+
+Run both `Bookings` and `Bookings.Payments` projects and then open `http://localhost:5051/swagger/index.html` and `http://localhost:5000/swagger/index.html` respectively. 
+Here you can use SwaggerUI to initiate commands and queries that will result in events being raised.
+
+### Example commands
+
+Bookings -> BookRoom (`/bookings/book`)
+
+This command raises and event which is stored in the database but also in Mongo via a registered projection
+
+Bookings.Payments -> RecordPayment (`/recordPayment`)
+
+This command raises multiple events which is stored in the database but also puts a message in RabbitMQ which is transformed from a domain event into an integration event. Upon the integration event being handled logic and other domain events are triggered resulting
+in more database entries and Mongo projection data being stored.
+
+Bookings.Payments -> `CommandService:RecordPayment` -> `PaymentRecorded` -> `IntegrationSubscription` -> `BookingPaymentRecorded` -> Bookings -> RabbitMQSubscription -> `PaymentsIntegrationHandler` -> `BookingsCommandService:OnExisting<RecordPayment>` -> `V1.PaymentRecorded` -> `BookingState:On<V1.PaymentRecorded>`-> `V1.BookingFullyPaid` -> `BookingStateProjection:On<V1.PaymentRecorded>` -> `BookingStateProjection:On<V1.BookingFullyPaid>`