Installation instructions are more complete

Author: sbellware

README.md

@@ -1,3 +1,5 @@
+![Message DB](http://docs.eventide-project.org/message-db-logo-90x105.png)
+
 # Message DB
 
 **Microservice Native Event Store and Message Store for Postgres**
@@ -18,6 +20,38 @@ For more information on the executables, see:
 
 [http://docs.eventide-project.org/user-guide/message-db/tools.html](http://docs.eventide-project.org/user-guide/message-db/tools.html)
 
+## Installation
+
+``` bash
+gem install message-db
+```
+
+## Create the Postgres Database
+
+Running the database installation tool creates the database, schema, table, indexes, functions, views, types, a user role, and limit the user's privileges to the message store's public interface.
+
+**Note: Make sure that your default Postgres user has administrative privileges.**
+
+The database installation Ruby executable will be installed with the `message-db` gem. The executable will be in the gem executable search path and may also be executed through bundler:
+
+``` bash
+bundle exec mdb-create-db
+```
+
+For more information about Ruby executables installed with the `message-db` Ruby Gem, see the Eventide docs on the administration tools that are bundled with the gem:
+
+[http://docs.eventide-project.org/user-guide/message-db/tools.html](http://docs.eventide-project.org/user-guide/message-db/tools.html)
+
+### Database Name
+
+By default, the database creation tool will create a database named `message_store`.
+
+If you prefer either a different database name, you can override the name using the `DATABASE_NAME` environment variable.
+
+``` bash
+DATABASE_NAME=some_other_database bundle exec mdb-create-db
+```
+
 ## Documentation
 
 See the Message DB documentation on the Eventide docs site: