Update README.md

Author: fititnt

README.md

@@ -9,6 +9,29 @@
 
 [![Grupo de Usuários do Padrão HXL da Comunidade dos Países de Língua Portuguesa](https://hxl.etica.ai/img/banner-hxl-cplp.png)](https://padrao-hxl.etica.ai/)
 
+## The Tips
+
+### References
+
+- **Referências sobre implementação**
+  - https://www.w3.org/International/questions/qa-html-language-declarations
+-   https://achecker.ca/checker/suggestion.php?id=48
+    - Can do the test again using https://achecker.ca/checker/
+  - https://webaim.org/standards/wcag/checklist#sc3.1.1
+    - See https://wave.webaim.org/report#/hxldash.com
+  - https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2
+  - **Potential specification to NOT set English as default** 
+    - https://www.w3.org/TR/i18n-html-tech-lang/#h2_overall
+      - "Always declare the default language for text in the page using attributes on the html tag, unless the document contains content aimed at speakers of more than one language. more..."
+- **Pontos de questão**
+  - https://github.com/SimonbJohnson/quickX3/issues/73 (we can reuse the references from here)
+  - https://github.com/HXLStandard/hxl-hashtag-chooser/pull/1 (this issue also have some references)
+  - https://github.com/webiwg/feedback-from-translators (old project with "feedback from translators" on @WebIWG)
+
+
+### Repository with code
+
+See <https://github.com/HXL-CPLP/internationalization-tips-samples>.
 
 ## Disclaimer
 The website https://padrao-hxl.etica.ai/ and