Change: Add Buttercup description

Author: alphapapa

README.org

@@ -2133,6 +2133,12 @@ Since this happens at macro expansion time rather than at runtime, there is no p
 :ID:       108f5eb6-7307-4d4b-aaf1-dd2a8bb65a58
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+#+BEGIN_QUOTE
+Buttercup is a behavior-driven development framework for testing Emacs Lisp code. It allows to group related tests so they can share common set-up and tear-down code, and allows the programmer to “spy” on functions to ensure they are called with the right arguments during testing.
+
+The framework is heavily inspired by Jasmine.
+#+END_QUOTE
+
 **** [[https://github.com/cask/cask][cask: Project management tool for Emacs]]
 
 #+BEGIN_QUOTE