Add Wallet

Requirements

Clicking "Add new wallet" button opens the modal.
- Clicking the "X" icon closes the modal.
"Add new Wallet" form
Modal "Add new wallet" form:
- Makes request to GET"/wallets" and shows spinner while request is in process.
- Shows "Network errror" and "Try again" button when request to GET "/wallets" fails.
- Clicking "Try again" button makes request to GET "/wallets".
"Add new Wallet Modal" fething wallets
Modal "Add new wallet" form (after GET /wallets is successful):
- "Add new wallet" form renders, a select element with the returned wallets is displayed.
- "Create wallet" button is displayed.
"Add new Wallet" form
Calls POST "/accounts" with wallet currency handles success (after selecting wallet):
```
data: {"currency": "BTC"}
```
- After clicking "Create wallet" button, the modal closes and the added wallet is rendered in the list.
Calls POST "/accounts" with wallet currency and handles error (after selecting wallet):

POST "/accounts" error