CONTRIBUTING.md

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+## Symbols
+Symbols are referenced from origin at pin 1
+
+![pin 1](./.allspice/images/pin1_ex.png)
+
+### connectors.SchLib
+The following properties are required for connectors:
+- **Design Item ID**: Part Number
+- **Voltage Rating**: {voltage}{V|mV}
+- **Current Rating**: {current}{A|mA}
+- **Contact Finish**: {Gold|Tin|Nickel}
+- **Manufacturer 1**: {manufacturer name specified in DigiKey}
+- **Manufacturer Part Number 1**: {manufacturer part number specified in DigiKey}
+- **Number of Positions**
+- **Pitch**: {inches}" ({millimeters}mm)
+- **Series**: {product series specified in DigiKey}