update baskerville scripts

Author: Kuanhao-Chao

src/baskerville/scripts/get_chrom_size.py

@@ -1,3 +1,18 @@
+#!/usr/bin/env python
+# Copyright 2025 Calico LLC
+
+# 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
+
+#     https://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 optparse import OptionParser
 
 def fasta_to_length_dict(filename):