rvm: add page (#2058)

pages/common/rvm.md

@@ -0,0 +1,31 @@
+# rvm
+
+> A tool for easily installing, managing, and working with multiple ruby environments.
+
+- Install one or more space-separated versions of Ruby:
+
+`rvm install {{version(s)}}`
+
+- Display a list of installed versions:
+
+`rvm list`
+
+- Use a specific version of Ruby:
+
+`rvm use {{version}}`
+
+- Set the default Ruby version:
+
+`rvm --default use {{version}}`
+
+- Upgrade a version of Ruby to a new version:
+
+`rvm upgrade {{current_version}} {{new_version}}`
+
+- Uninstall a version of Ruby and keep its sources:
+
+`rvm uninstall {{version}}`
+
+- Remove a version of Ruby and its sources:
+
+`rvm remove {{version}}`