feat: add en readme

README.en.md

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+Library with functions for Brazilian data formatting.
+
+CPF/CNPJ: Returns either CPF or CNPJ format based on the input length.
+
+```js
+import { formatarCep } from "lhmask";
+
+console.log(formatarCep("12345000")); // Output: 12.345-000
+
+console.log(formatarCnpj("12123456000100")); // Output 12.123.456/0001-00
+
+console.log(formatarCpf("12345678900")); // Output: 123.456.789-00
+
+console.log(formatarCpfCnpj("12123456000100")); // Output 12.123.456/0001-00
+
+console.log(formatarCpfCnpj("12345678900")); // Output: 123.456.789-00
+
+console.log(formatarContaBancaria("12345")); // Output: 1234-5
+
+console.log(formatarTelefone("88912341234")); // Output: (88)91234-1234.
+console.log(formatarTelefone("8834001234")); // Output: (88)3400-1234.
+console.log(formatarTelefone("08001234567")); // Output: 0800-123-4567
+
+// Returns the formatted value according to the specified string.
+// Possible values: cep, cpf, cnpj, cpfcnpj, contabancaria.
+console.log(formatarValor("12345", "contabancaria")); // Output: 1234-5
+```