New Args definition for CreateContribution.

backend/src/graphql/arg/CreateContributionArgs.ts

@@ -0,0 +1,15 @@
+import { ArgsType, Field, InputType } from 'type-graphql'
+import Decimal from 'decimal.js-light'
+
+@InputType()
+@ArgsType()
+export default class CreateContributionArgs {
+  @Field(() => Decimal)
+  amount: Decimal
+
+  @Field(() => String)
+  memo: string
+
+  @Field(() => String)
+  creationDate: string
+}