Add description of data

systems2atoms/surrogates/data/readme.md

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+# About this data
+
+This data was obtained computationally using the code in the `systems` module found in this repository. 
+
+# Units
+
+## Cost Data
+| Column | Name | Unit |
+|--------|------|------|
+| 0 | Station Capacity | kg $H_2$ per day |
+| 1 | CSTR Volume | $m^3 |
+| 2 | Hydrogen Yield | Fraction |
+| 3 | Catalyst Mass | kg |
+| 4 | Temperature | K |
+| 5 | Pressure | bar |
+| 6 | Catalyst Price | $ per kg metal |
+| 7 | Leveilzed Cost of Hydrogen | $ per kg $H_2$
+
+
+## Component Data
+
+| Column | Name | Unit |
+|--------|------|------|
+| 0 | CSTR Volume | $m^3$ |
+| 1 | Pellet Effectivenes Factor | Fraction |
+| 2 | Dehydrogenation Reaction Order | Unitless |
+| 3 | Turnover Frequency | Hz |
+| 4 | Catalyst Metal Amount | mol |
+| 5 | Hydrogen Yield | Fraction |
+
+## Nanoparticle Data
+| Column | Name | Unit |
+|--------|------|------|
+| 0 | Catalyst Metal Choice | N/A |
+| 1 | Temperature | K |
+| 2 | Pressure | bar |
+| 3 | Pressure | atm |
+| 4 | Turnover Frequency | (mol H2/mol Pd*hr) |
+| 5 | Turnover Frequency | (mol H2/mol Pd*sec) |