add: add two new api for finance

core/apps/finance/serializers/expence_contract.py

@@ -81,3 +81,7 @@ class ExpenceContractCreateSerializer(serializers.ModelSerializer):
             )
             return expence_contract
 
+
+
+class ExpenceContractCalculatePriceSerializer(serializers.Serializer):
+    price = serializers.IntegerField()

core/apps/finance/serializers/income_contract.py

@@ -76,4 +76,6 @@ class IncomeContractCreateSerializer(serializers.ModelSerializer):
             )
             return income_contract
         
-    
+    
+class IncomeContractCalculatePriceSerializer(serializers.Serializer):
+    price = serializers.IntegerField()