Add impl for new method of AccountAnalytics.java

Author: tboychuk

account-analytics/src/main/java/com.bobocode/AccountAnalytics.java

@@ -111,7 +111,9 @@ public List<Account> sortByFirstAndLastNames() {
      * @return true if there is an account that has an email with provided domain
      */
     public boolean containsAccountWithEmailDomain(String emailDomain) {
-        throw new UnsupportedOperationException("It's your job to implement this method"); // todo
+        return accounts.stream()
+                .map(Account::getEmail)
+                .anyMatch(email -> email.split("@")[1].equals(emailDomain));
     }
 
     /**