workshop setup instruction

WORKSHOP.md

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+To ensure maximum use of the time during the workshop, please set up the project before it.
+We use Makefile to make the setup simple. However, if you run into a problem
+during setup, please reach us so we can help you set it up before the workshop.
+
+1. Clone the project `git clone git@github.com:RailsEventStore/ecommerce.git`
+2. `cd ecommerce`
+3. run `make install`
+4. run `make dev` - the app should be up and running. Take a look around
+5. run `make test` to make sure the tests are running. Tests will be important
+part of the workshop
+6. Take a look at `README.md`. It explains how the app is structured and the goal
+of this repository
+
+See you at the workshop 👋