README.md in ruby_uml_class-0.1.0 vs README.md in ruby_uml_class-0.2.0

- old
+ new

@@ -1,9 +1,13 @@
 # RubyUmlClass
 
-Welcome to your new gem! In this directory, you'll find the files you need to be able to package up your Ruby library into a gem. Put your Ruby code in the file `lib/ruby_uml_class`. To experiment with that code, run `bin/console` for an interactive prompt.
+RubyUmlClass creates a Ruby class diagram.  
+PlantUML and rufo commands are used to create class diagrams.  
+The created class diagram is displayed on the browser screen.  
 
-TODO: Delete this and the text above, and describe your gem
+## Setup
+    for ubuntu
+    $ sudo apt install plantuml
 
 ## Installation
 
 Install the gem and add to the application's Gemfile by executing:
 