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docs/zagros/operation-accounting.md

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+# operation: accounting
+
+###### Sprint: ?
+
+### Outcome:
+a simple information about operations.
+
+#### File destination:
+
+{$Dena_Path}/app/model/operations/
+
+##### Doc
+
+* Operation:
+
+this is the base class for operations and subcategories Heir from it.
+operation column:
+1. reference: it has polymorphic for every type of references(for example trades or withdraws or deposit or ..)
+2. currencies: code of currency 
+3. credit: plus funds
+4. debit: minus funds
+5. account
+
+methods of operations were implemented in this class and subcategories only use them.
+
+```mermaid
+graph TD
+    A[operation] -->|inheritance| B(Expense)
+    A[operation] -->|inheritance| C(Asset)
+    A[operation] -->|inheritance| D(Liability)
+    A[operation] -->|inheritance| E(Revenue)
+```
+this chart showed inheritance structure of operation.
+
+1. Expense:<br >
+   Expense is a income statement operation.
+   
+2. Asset<br >
+   is a balance sheet operation.every income/outcome of system store and controll by it.
+   
+3. Liability<br >
+   is a balance sheet operation and belongs to members and we manage members accounting things by it.
+   for example trades and deposit.
+   
+4. Revenue:<br >
+   is a income statement operation and we manage exchange revenue by it.
+   
+####SO:
+* revenue --> revenue of exchange
+* liability --> users accounting
+* asset --> exchange assets
+* expense --> ?
+