Update cheatsheets

tldr/rails-console

@@ -0,0 +1,25 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# rails console
+
+> Interact with a Rails application.
+> More information: <https://guides.rubyonrails.org/command_line.html#bin-rails-console>.
+
+- Start the Rails console:
+
+`rails console`
+
+- Start the Rails console and roll back all data modifications on exit:
+
+`rails console --sandbox`
+
+- Start the Rails console on a specified environment:
+
+`rails console --environment {{dev|test|production|...}}`
+
+- Display help:
+
+`rails console --help`