Added Readme for surface charge script SCI-1396

Author: Alex-AMC

scripts/surface_charge/ReadMe.md

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+# Surface Charge Calculator
+
+## Summary
+
+This tool returns the surface charge for a given structure and list of supplied hkl and offsets. 
+The script provides a GUI that can be used from Mercury or from the command line. 
+
+The output is a HTML file with a table for all the all selected surfaces and their associated charge, projected surface areas and normalised surface charge. 
+
+Charges are currently calculated using Gasteiger charges. Further development could be made to use user derived charges. Please let me know if that is something you'd like [[email protected]]([email protected]).
+
+Example Output: 
+![Example Output](assets/example_output.png)
+
+> **Note** - When comparing charges for structures out of the CSD and from mol2 files the values might be different as the bonding might not be the same. When importing a mol2 the bonding and charges have to be calculated on the fly. Whereas the CSD structures the bonding is pre-assigned. 
+
+## Requirements
+
+- Requires a minimum of CSD 2022.2 
+
+## Licensing Requirements
+
+- CSD-Particle Licence
+
+## Instructions on Running
+
+- To Run from command line:
+```commandline
+# With an activated environment
+> python surface_charge.py
+```
+- To run from mercury: 
+Add the folder containing the script to your Python API menu. Mercury -> CSD Python API-> Options -> Add Location. Then just select the `surface_charge.py` script from the drop down menu
+![Adding_Locations](assets/adding_location.png)
+![Selecting Scripts](assets/selecting_script.png)
+
+Running either from the command line or Mercury you will get the same interface allowing you to select a refcode from the CSD or input a mol2 file directly.
+
+Example input : 
+![Example Input](assets/example_input.png)
+
+## Author
+
+Alex Moldovan (2024)
+
+> For feedback or to report any issues please contact [[email protected]](mailto:[email protected])