add exchange order screen

app/javascript/__generated__/schema.graphql

@@ -39,6 +39,36 @@ type Currency implements Node {
   name: String!
 }
 
+"""
+The connection type for Currency.
+"""
+type CurrencyConnection {
+  """
+  A list of edges.
+  """
+  edges: [CurrencyEdge!]!
+
+  """
+  Information to aid in pagination.
+  """
+  pageInfo: PageInfo!
+}
+
+"""
+An edge in a connection.
+"""
+type CurrencyEdge {
+  """
+  A cursor for use in pagination.
+  """
+  cursor: String!
+
+  """
+  The item at the end of the edge.
+  """
+  node: Currency!
+}
+
 type FiatBalance implements Node {
   amountCents: Int!
   amountCurrency: String!
@@ -139,6 +169,27 @@ type Query {
     """
     last: Int
   ): BalanceConnection!
+  currencies(
+    """
+    Returns the elements in the list that come after the specified cursor.
+    """
+    after: String
+
+    """
+    Returns the elements in the list that come before the specified cursor.
+    """
+    before: String
+
+    """
+    Returns the first _n_ elements from the list.
+    """
+    first: Int
+
+    """
+    Returns the last _n_ elements from the list.
+    """
+    last: Int
+  ): CurrencyConnection!
   currentUser: User
   fiatBalances(
     """