translation brazilian portuguese (#26769)

* add translation brazilian portuguese

* add translation brazilian portuguese

* add translation brazilian portuguese title

* add translation portuguese tag

* Update README_pt-br.md
Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>

* Update README_pt-br.md
Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>

* Update README_pt-br.md
Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>

* Update README_pt-br.md
Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>

---------
Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>

README.md

@@ -52,7 +52,8 @@ limitations under the License.
         <a href="https://github.com/huggingface/transformers/blob/main/README_es.md">Español</a> |
         <a href="https://github.com/huggingface/transformers/blob/main/README_ja.md">日本語</a> |
         <a href="https://github.com/huggingface/transformers/blob/main/README_hd.md">हिन्दी</a> |
-        <a href="https://github.com/huggingface/transformers/blob/main/README_ru.md">Русский</a>
+        <a href="https://github.com/huggingface/transformers/blob/main/README_ru.md">Русский</a> |
+        <a href="https://github.com/huggingface/transformers/blob/main/README_pt-br.md">Рortuguês</a> |
     </p>
 </h4>