`to` and `from` dropdown

[Manish Ram]

• to dropdown will list the friend's account numbers but at the same time, it should also be editable so that users can send coins to non-friend accounts as well.

• Dropdown should not push down the screen elements.
  Design: https://www.figma.com/file/h6f3frXkqhEegiHdmQFhRR/Cryptocurrency-App?node-id=364%3A2027

• Dropdown background: #1E323AE5;

• Display both name and account number.