Add MacOs to resolve cadet paths

Author: hannahlanzrath

cadet/cadet.py

@@ -87,6 +87,9 @@ def resolve_cadet_paths(
     if platform.system() == 'Windows':
         dll_path = cadet_root / 'bin' / 'cadet.dll'
         dll_debug_path = cadet_root / 'bin' / 'cadet_d.dll'
+    elif platform.system() == 'Darwin':
+        dll_path = cadet_root / 'lib' / 'libcadet.dylib'
+        dll_debug_path = cadet_root / 'lib' / 'libcadet_d.dylib'
     else:
         dll_path = cadet_root / 'lib' / 'libcadet.so'
         dll_debug_path = cadet_root / 'lib' / 'libcadet_d.so'