Create README.md

Author: leoberhelman

README.md

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+# UMfile_utils
+
+UMfile_util is a Python library that provides specific tools to edit UM dump and field files.
+
+# UMfile_utils Desciption
+
+This package will include three abilities
+
+### perturbIC.py 
+If the simulation fails, this code allows for minor random perturbation of the input theta (surface termperature) in the restart files. 
+Then the simulation can be rerun to avoid crashing. In the future functionality will be added to perturb other fields as well. 
+
+### um_fields_subset.py
+
+This code runs on a Dump file and allows the user to select a group of fields in the file to store 
+in a new fields file or exclude a group of fields from the file. Both of these functionalities will 
+create a new output file. 
+NEED TO ADD USE CASES
+
+### change_date.py
+NEED TO ADD DESCRIPTION 
+
+
+Currently these files only operate on Dump files and include a work around to deal with the river field grids.
+
+## Installation
+DICUSS AT SOME POINT
+
+## Usage
+
+```python
+If the user wants to run perturbIC with a specific output filename
+python perturbIC input_file_path -a 0.01 -s 2234 -o output_file_path
+
+Otherwise it is optional perturbIC will create a filename from the input path
+python perturbIC input_file_path -a 0.01 -s 2234
+
+The amplitude and seed are also optional as well
+python perturbIC input_file_path -a 0.01 -s 2234
+
+To take a subset of field the user must provide a either a list of fields to exculde (-x)
+python um_fields_subset.py input_file_path -x 155,156,3100,3101 
+
+To take a subset of field the user must provide a either a list of fields to include (-v)
+python um_fields_subset.py input_file_path -v 155,156,3100,3101
+
+Or you can choose to have the program to only include pronostics -p
+python um_fields_subset.py input_file_path -p
+
+These three options must be run seperately
+
+```
+
+## Contributing
+
+
+
+## License
+
+NEED TO ADD THE LICENSE