Added readme

README.md

@@ -39,12 +39,31 @@ IDENTIFIER,ATOM-USD,Cosmos USD
 ### Supported formats
 | Platform | Source of the files | Buy | Sell | Dividend | 
 |--|--|--|--|--|
+| Generic importer | See below | X | X | X |
 | Trading 212 | Export of transaction history | X | X | X |
 | De Giro | Export of transaction history | X | - | - |
 | Scalable Capital | The CSV files of the Baader bank. Type WUM and RKK | X | X | X |
 | Coinbase (Experimental) | Export of transaction history | X | X | - |
 | Nexo (Experimental) | Export of transaction history | X | - | - |
 
+#### Generic import format
+Beside the supported exchanges and brokers there is also a generic format:
+
+| Field | Value(s) | 
+| ----- | ----- |
+| OrderType | BUY ,SELL or DIVIDEND | 
+| Symbol | The symbol to search
+| Date | The date, yyyy-MM-dd |
+| Currency | The currency of the unitprice and fee |
+| Quantity | The amount of units |
+| UnitPrice | The paid price per unit |
+| Fee | The total fee paid for the transaction |
+
+##### Example
+
+OrderType,Symbol,Date,Currency,Quantity,UnitPrice,Fee
+BUY,US67066G1040,2023-08-07,USD,0.0267001000,453.33,0.02
+
 ## Run in Docker
 The docker image is: vibenl/ghostfoliosidekick