diff --git a/CONTRIBUTING.MD b/CONTRIBUTING.MD
new file mode 100644
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--- /dev/null
+++ b/CONTRIBUTING.MD
@@ -0,0 +1,13 @@
+# Contributing
+
+Contributing to this project should be as easy and transparent as possible.
+
+## Workflow
+
+1.  Fork the repository and create your branch from `master`.
+2.  If you've changed the functionality, update the documentation.
+3.  Issue that pull request! :tada:
+
+## License
+
+By contributing, you agree that your contributions will be licensed under the [MIT License](https://choosealicense.com/licenses/mit/).
diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -18,6 +18,18 @@
 ```sh
 npx create-expo-app init MyApp --template template-reactnative-setup
 ```
+
+## ⚒️ How to Environments:
+- create a file .env, inside these files creates its variables:
+
+```.env
+BASE_URL=
+```
+
+## :computer: Contributing
+
+Contributions are very welcome. Please check out the [contributing document](https://github.com/Luizrebelatto/template-reactnative-setup/blob/master/CONTRIBUTING.MD).
+
 ## :bookmark: License
 
 This project is [MIT](https://github.com/Luizrebelatto/template-reactnative-setup/blob/master/LICENSE) licensed.