Sfc config Added. (#47)

I have added `era5_sfc.cfg` file which is useful to create a
`Single-level-reanalysis.zarr` zarr file.

raw/era5_sfc.cfg

@@ -0,0 +1,53 @@
+# Copyright 2023 Google 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.
+[parameters]
+client=cds
+dataset=reanalysis-era5-complete
+target_path=gs://gcp-public-data-arco-era5/raw/ERA5GRIB/HRES/Month/{year}/{year}{month:02d}_hres_sfc.grb2
+partition_keys=
+    year
+    month
+
+# API Keys go here...
+# See these docs: https://weather-tools.readthedocs.io/en/latest/Configuration.html#subsections
+
+[selection]
+class=ea
+stream=oper
+expver=1
+levtype=sfc
+type=an
+year=1979/to/2023
+month=01/to/12
+day=all
+time=00/to/23
+# ------------------------------------------------|------------|--------------|-----------------------------------------------------
+# name                                            | short name | units        | docs
+# ------------------------------------------------|------------|--------------|-----------------------------------------------------
+# Geopotential	                                  | z	       | m^2 s^-2	  | https://apps.ecmwf.int/codes/grib/param-db?id=129
+# Surface pressure	                              | sp	       | Pa	          | https://apps.ecmwf.int/codes/grib/param-db?id=134
+# Total column vertically-integrated water vapour |	tcwv	   | kg m^-2      | https://apps.ecmwf.int/codes/grib/param-db?id=137
+# Mean sea level pressure	                      | msl	       | Pa	          | https://apps.ecmwf.int/codes/grib/param-db?id=151
+# Total cloud cover                               |	tcc	       | (0 - 1)	  | https://apps.ecmwf.int/codes/grib/param-db?id=164
+# 10 metre U wind component	                      | 10u	       | m s^-1	      | https://apps.ecmwf.int/codes/grib/param-db?id=165
+# 10 metre V wind component	                      | 10v	       | m s^-1	      | https://apps.ecmwf.int/codes/grib/param-db?id=166
+# 2 metre temperature	                          | 2t	       | K	          | https://apps.ecmwf.int/codes/grib/param-db?id=167
+# 2 metre dewpoint temperature	                  | 2d	       | K	          | https://apps.ecmwf.int/codes/grib/param-db?id=168
+# Low cloud cover	                              | lcc	       | (0 - 1)	  | https://apps.ecmwf.int/codes/grib/param-db?id=186
+# Medium cloud cover	                          | mcc	       | (0 - 1)	  | https://apps.ecmwf.int/codes/grib/param-db?id=187
+# High cloud cover	                              | hcc	       | (0 - 1)	  | https://apps.ecmwf.int/codes/grib/param-db?id=188
+#100 metre U wind component                       |	100u       | m s^-1	      | https://apps.ecmwf.int/codes/grib/param-db?id=228246
+#100 metre V wind component                       |	100v	   | m s^-1	      | https://apps.ecmwf.int/codes/grib/param-db?id=228247
+# ------------------------------------------------|------------|--------------|-----------------------------------------------------
+param=129.128/134.128/151.128/165.128/166.128/167.128/168.128/246.228/247.228/137.128/164.128/186.128/187.128/188.128