Create bundler.md

some basic functions for using bundler/bundle

pages/common/bundler.md

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+#bundler
+
+> Dependency manager for the Ruby programming language.
+
+- Installs all gems defined in the {{Gemfile}} expected in the working directory.
+
+`bundle install`
+
+- Update all gems by the rules defined in the {{Gemfile}} and regenerate {{Gemfile.lock}}
+
+`bundle update`
+
+- Update one specific gem defined in the {{Gemfile}}
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+`bundle update --source {{gemname}}`
+
+- Create a new gem skeleton
+
+`bundle gem {{gemname}}`