docs: adicionar guia de contribuição

CONTRIBUTING.md

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+# Contribution Guide
+
+Note: Only contributions that follow these requirements will be accepted.
+
+# Contribution Types
+
+## Bug Reports
+To report bugs, make sure there are no similar ones already open in [Github issues](https://github.com/Flutterando/getapps/issues)
+- Detailed description of the problem
+- Steps to reproduce the problem
+- Version of the software where the problem was found
+- Expected behavior
+- Screenshots or logs, if applicable
+- Information about the environment where the problem occurred
+
+## Bug Fixes
+To contribute with bug fixes:
+1. Check if the problem has already been reported in [Github issues](https://github.com/Flutterando/getapps/issues).
+2. Select an issue you would like to resolve.
+3. Comment on the issue to request to work on the fix.
+4. Follow the instructions in the "How to Contribute" section below to submit your fix.
+
+## New Features
+To request new features, make a brief description of the feature in [Github issues](https://github.com/Flutterando/getapps/issues)
+- A clear description of the desired feature
+- Wait for the team's evaluation on the implementation of the feature
+
+## Documentation
+If you want to contribute to the documentation or any improvement:
+1. Open an (issue)[https://github.com/Flutterando/getapps/issue].
+2. Make the changes or additions.
+3. Follow the instructions in the "How to Contribute" section below to submit your updates.
+
+# How to Contribute
+1. **Fork the repository**: Click the "Fork" button in the upper right corner of the repository page.
+2. **Clone the repository**: Clone your fork locally using the command:
+    ```sh
+    git clone https://github.com/your-username/getapps.git
+    ```
+3. **Create a branch**: Create a new branch for your contribution:
+    ```sh
+    git checkout -b my-contribution
+    ```
+4. **Make the changes**: Make the necessary changes to the code.
+5. **Commit your changes**: Commit your changes with a descriptive message:
+    ```sh
+    git commit -m "Description of my changes"
+    ```
+6. **Push to your fork**: Push your changes to your fork on GitHub:
+    ```sh
+    git push origin my-contribution
+    ```
+7. **Open a Pull Request**: In the original repository, click the "New Pull Request" button and select your branch.
+   1. The title of the pull request must always follow the [semantic commit](https://www.conventionalcommits.org/en/v1.0.0/) standard.
+
+## Requirements
+- Format the code according to the `analysis_options.yaml` file.
+- Make sure the code is well documented.
+- Write tests for your changes and make sure all existing tests pass.