[GR-19691] Add mise instructions on ruby-managers.md (#3817)

PullRequest: truffleruby/4526

Author: andrykonchin

doc/user/ruby-managers.md

@@ -6,7 +6,7 @@ permalink: /reference-manual/ruby/RubyManagers/
 ---
 # Ruby Managers and Installers
 
-TruffleRuby is supported by the 3 major Ruby installers.
+TruffleRuby is supported by all major Ruby installers.
 
 ## `rvm`
 
@@ -81,6 +81,24 @@ You can also install the TruffleRuby JVM Standalone with:
 asdf install ruby truffleruby+graalvm-VERSION OR truffleruby+graalvm-dev
 ```
 
+## `mise`
+
+Mise includes a Ruby plugin. See https://mise.jdx.dev/lang/ruby.html for details.
+
+You can install a TruffleRuby Native Standalone release or dev build with:
+
+```bash
+mise install ruby@truffleruby-VERSION
+mise install ruby@truffleruby-dev    # latest dev version
+```
+
+You can also install the TruffleRuby JVM Standalone with:
+
+```
+mise install ruby@truffleruby+graalvm-VERSION
+mise install ruby@truffleruby+graalvm-dev    # latest dev version
+```
+
 ## `ruby-install` and `chruby`
 
 See https://github.com/postmodern/ruby-install#install for installing and updating `ruby-install`.