[Makefile] Add CONTRIBUTING.md (Fixes #2984)

devscripts/make_contributing.py

@@ -0,0 +1,31 @@
+#!/usr/bin/env python
+from __future__ import unicode_literals
+
+import argparse
+import io
+import re
+
+
+def main():
+    parser = argparse.ArgumentParser()
+    parser.add_argument(
+        'INFILE', help='README.md file name to read from')
+    parser.add_argument(
+        'OUTFILE', help='CONTRIBUTING.md file name to write to')
+    args = parser.parse_args()
+
+    with io.open(args.INFILE, encoding='utf-8') as inf:
+        readme = inf.read()
+
+    bug_text = re.search(
+        r'(?s)#\s*BUGS\s*[^\n]*\s*(.*?)#\s*COPYRIGHT', readme).group(1)
+    dev_text = re.search(
+        r'(?s)(#\s*DEVELOPER INSTRUCTIONS.*?)#\s*BUGS', readme).group(1)
+
+    out = bug_text + dev_text
+
+    with io.open(args.OUTFILE, 'w', encoding='utf-8') as outf:
+        outf.write(out)
+
+if __name__ == '__main__':
+    main()