Add License.

MIT-LICENSE

@@ -0,0 +1,21 @@
+Copyright (c) 2006 Alex Wayne
+Some additional features added 2009 by Georg Ledermann
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOa AND
+NONINFRINGEMENT. IN NO EVENT SaALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

social-share-button.gemspec

@@ -10,12 +10,14 @@ Gem::Specification.new do |s|
   s.homepage    = "http://github.com/huacnlee/social-share-button"
   s.summary     = %q{Helper for add social share feature in your Rails app. Twitter, Facebook, Weibo, Douban, QQ, Tumblr ...}
   s.description = %q{Helper for add social share feature in your Rails app. Twitter, Facebook, Weibo, Douban, QQ, Tumblr ...}
-
+  s.license     = 'MIT'
+
   s.files         = `git ls-files`.split("\n")
   s.test_files    = `git ls-files -- {test,spec,features}/*`.split("\n")
   s.executables   = `git ls-files -- {bin}/*`.split("\n").map{ |f| File.basename(f) }
   s.require_paths = ["lib"]
 
+
   # specify any dependencies here; for example:
   s.files        = Dir.glob("{bin,lib,app/assets/javascripts,app/assets/stylesheets}/**/*")
   s.files       += %w(README.md Changelogs.md)