Implement account creation to pass test.

src/main/kotlin/camilyed/github/io/currencyexchangeapi/Account.kt

@@ -0,0 +1,9 @@
+package camilyed.github.io.currencyexchangeapi
+
+import java.util.UUID
+
+data class Account(
+    val id: UUID,
+    val owner: String,
+    val balancePln: Double
+)

src/main/kotlin/camilyed/github/io/currencyexchangeapi/AccountService.kt

@@ -0,0 +1,10 @@
+package camilyed.github.io.currencyexchangeapi
+
+import java.util.*
+
+class AccountService {
+
+    fun create(name: String, balance: Double): Account {
+        return Account(id = UUID.randomUUID(), owner = name, balancePln = balance)
+    }
+}

src/test/kotlin/AccountServiceTest.kt → src/test/kotlin/camilyed/github/io/currencyexchangeapi/AccountServiceTest.kt

@@ -1,9 +1,13 @@
+package camilyed.github.io.currencyexchangeapi
+
 import org.junit.jupiter.api.Assertions.assertEquals
 import org.junit.jupiter.api.Assertions.assertNotNull
 import org.junit.jupiter.api.Test
 
 class AccountServiceTest {
 
+    var accountService = AccountService()
+
     @Test
     fun `should create a new account with valid details`() {
         // given
@@ -18,4 +22,4 @@ class AccountServiceTest {
         assertEquals(initialBalance, account.balancePln, "Account balance in PLN should match initial balance")
         assertEquals(name, account.owner, "Account owner name should match provided name")
     }
-}
+}