Readme update

README.md

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 **Documentation**
 
 This tool is part of a publication currently undergoing submission process.
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+Adding Active Materials to Database - The following parameters need to be known for proper calculation:
+- Mechanism of electrochemical reaction (number of transfered electrons | number of transfered protons at defined pH value)
+- Solubility
+- Redox potential
+- Diffusion coefficient
+- Reaction rate constant + charge transfer coefficient
+- Capacity fade rate / capacity retention
+- In case of organic solvents: Density, dyn./kin. viscosity as well as electrochemical stability window of selected solvent