add create sell and buy crypto order mutations

app/graphql/inputs/create_buy_crypto_order_attributes_input.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+module Inputs
+  class CreateBuyCryptoOrderAttributesInput < Types::BaseInputObject
+    argument :currency_id, ID, required: true
+    argument :amount_cents, Integer, "Amount to be paid", required: true
+  end
+end

app/graphql/inputs/create_sell_crypto_order_attributes_input.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+module Inputs
+  class CreateSellCryptoOrderAttributesInput < Types::BaseInputObject
+    argument :currency_id, ID, required: true
+    argument :amount, String, "Amount to be paid", required: true
+  end
+end