Update function name

README.md

 # Compressor that uses h5netcdf and hdf5plugin to compress files.
 
+To use the compressor:
+
 ```python
 from h5netcdfcompressor import transfer_file
 
-transfer_file(origin, destination, compression)
+compress_file(origin="original.nc", destination="compressed.nc", compression="lossy,sz,rel,1e-6")
 
 ```

h5netcdfcompressor/__init__.py

+from compressor import compress_file

h5netcdfcompressor/compressor.py

@@ -2,7 +2,7 @@ from pathlib import Path
 from typing import List
 
 
-def transfer_file(origin: Path,
+def compress_file(origin: Path,
                   destination: Path,
                   compression: str,
                   variables_to_keep: List[str] = None,