adding to documentation env vars that need to be set in production environment

README.md

@@ -23,7 +23,27 @@ orient db migrations and populate active record database:
 Some definitions and vocabulary of project domain model.
 
 ## Deploy
-For deploy, you will need a server and some user with your ssh public key.
+Before deploy, some env vars need be set:
+ 
+ ### Secrets
+  * SECRET_TOKEN
+  * SECRET_KEY_BASE
+  
+ ### Active Record database
+  * PORTALMEC_DB_NAME
+  * PORTALMEC_DB_USERNAME
+  * PORTALMEC_DB_PASSWORD
+  
+ ### Orient Db database
+  * PORTALMEC_ORIENTDB_HOST
+  * PORTALMEC_ORIENTDB_DATABASE
+  * PORTALMEC_ORIENTDB_USERNAME
+  * PORTALMEC_ORIENTDB_PASSWD
+  * PORTALMEC_ORIENTDB_PORT
+  
+ ### Rails environment
+  * RAILS_SERVE_STATIC_FILES - default is FALSE
+  * RAILS_ENV: production, test or development
  
 Run: ```
  $ mina setup