add license information

lib/opus-ruby/encoder.rb

@@ -1,3 +1,29 @@
+#################################################################################
+# The MIT License (MIT)                                                         #
+#                                                                               #
+# Copyright (c) 2015, dafoxia <[email protected]>                        #
+# Based on code (c) GitHub User 'mattvperry' and code found in the              #
+# libopus public documentation.                                                 #
+#                                                                               #
+# 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 PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 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.                                                                 #
+#################################################################################
+
 module Opus
   class Encoder
     attr_reader :sample_rate, :frame_size, :channels,