Added data sources section to readme

README.md

@@ -160,8 +160,6 @@ smart_variables:
 
 The first column is the value of the variable, and the second column is the label.
 
-## Results
-
 ### Linked Columns
 
 Link results to other pages in your apps or around the web. Specify a column name and where it should link to. You can use the value of the result with `{value}`.
@@ -243,18 +241,26 @@ SELECT * FROM events WHERE started_at > ended_at
 
 Then create check with optional emails if you want to be notified. Emails are sent when a check starts failing, and when it starts passing again.
 
-## Learn SQL
-
-Have team members who want to learn SQL? Here are a few great, free resources.
+## Data Sources
 
-- [Khan Academy](https://www.khanacademy.org/computing/computer-programming/sql)
-- [Codecademy](https://www.codecademy.com/courses/learn-sql)
+Blazer supports multiple data sources :tada:
 
-## Useful Tools
+Add additional data sources in `config/blazer.yml`:
 
-For an easy way to group by day, week, month, and more with correct time zones, check out [Groupdate](https://github.com/ankane/groupdate.sql).
+```yml
+data_sources:
+  main:
+    url: <%= ENV["BLAZER_DATABASE_URL"] %>
+    # timeout, smart_variables, linked_columns, smart_columns
+  catalog:
+    url: <%= ENV["CATALOG_DATABASE_URL"] %>
+    # ...
+  redshift:
+    url: <%= ENV["REDSHIFT_DATABASE_URL"] %>
+    # ...
+```
 
-## Redshift
+### Redshift
 
 Add [activerecord4-redshift-adapter](https://github.com/aamine/activerecord4-redshift-adapter) to your Gemfile and set:
 
@@ -262,6 +268,17 @@ Add [activerecord4-redshift-adapter](https://github.com/aamine/activerecord4-red
 ENV["BLAZER_DATABASE_URL"] = "redshift://user:password@hostname:5439/database"
 ```
 
+## Learn SQL
+
+Have team members who want to learn SQL? Here are a few great, free resources.
+
+- [Khan Academy](https://www.khanacademy.org/computing/computer-programming/sql)
+- [Codecademy](https://www.codecademy.com/courses/learn-sql)
+
+## Useful Tools
+
+For an easy way to group by day, week, month, and more with correct time zones, check out [Groupdate](https://github.com/ankane/groupdate.sql).
+
 ## Upgrading
 
 ### 1.0