add license info

normalizer/normalizer-prototypes/classify4me_prototypes.py

@@ -6,6 +6,19 @@ on the basis of the space_group and normalized_wyckoff, and adds labels to the c
  - prototype_label (with labels in the same format as 
 in the read_prototypes function).
 """
+# Copyright 2017-2018 Daria M. Tomecka, Fawzi Mohamed
+# 
+#   Licensed under the Apache License, Version 2.0 (the "License");
+#   you may not use this file except in compliance with the License.
+#   You may obtain a copy of the License at
+# 
+#     http://www.apache.org/licenses/LICENSE-2.0
+# 
+#   Unless required by applicable law or agreed to in writing, software
+#   distributed under the License is distributed on an "AS IS" BASIS,
+#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#   See the License for the specific language governing permissions and
+#   limitations under the License.
 
 from __future__ import absolute_import