Added note about db migration before first run

README.md

@@ -6,11 +6,12 @@ to see a list of all branches/frameworks.
 
 ## [Ruby on Rails](http://rubyonrails.org/)
 
- * Setup: 
-  * Install ruby (I used version ```2.2.3p173```)
+ * Setup for testing: 
+  * Install ruby (I used version ```2.2.3p173```) and sqlite3
   * Install rails: ```gem install rails```
   * Create application: ```rails new appName```
  * Run server with auto-reload: ```bin/rails server```
+  * Before first run, initialize databases: ```bin/rake db:migrate```
  * Getting started: http://guides.rubyonrails.org/getting_started.html
   * Easy to create a REST API etc.
   * DB migrations on default