added DB config

Rakefile

@@ -1,4 +1,4 @@
-README.rdoc# Add your own tasks in files placed in lib/tasks ending in .rake,
+# Add your own tasks in files placed in lib/tasks ending in .rake,
 # for example lib/tasks/capistrano.rake, and they will automatically be available to Rake.
 
 require File.expand_path('../config/application', __FILE__)

config/database.yml

@@ -0,0 +1,34 @@
+default: &default
+  adapter: 'mysql2'
+  username: 'root'
+  host: localhost
+  pool: 5
+  timeout: 5000
+
+development:
+  <<: *default
+  database: backend_dev
+
+test:
+  <<: *default
+  database: backend_test
+
+staging:
+  adapter: 'mysql2'
+  database: <%= ENV['BACKEND_DB'] %>
+  username: <%= ENV['BACKEND_DB_USER'] %>
+  password: <%= ENV['BACKEND_DB_PASSWORD'] %>
+  host: <%= ENV['BACKEND_DB_HOST'] %>
+  pool: 5
+  timeout: 5000
+  reconnect: true
+
+production:
+  adapter: 'mysql2'
+  database: <%= ENV['BACKEND_DB'] %>
+  username: <%= ENV['BACKEND_DB_USER'] %>
+  password: <%= ENV['BACKEND_DB_PASSWORD'] %>
+  host: <%= ENV['BACKEND_DB_HOST'] %>
+  pool: 10
+  timeout: 5000
+  reconnect: true