Merge pull request #3 from elemental-source/adiciona-guia-contribuicao

Add contributing guide

Author: resilva87

CONTRIBUTING.md

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+# Contributing
+:clap::tada: Thank you for taking the time to contribute! :tada::clap:
+
+We really value your willingness to contribute to this project. In order to higher the chances of your contribution being accepted, please refer to the following guidelines!
+
+## Steps
+
+1. Fork it!
+2. Create your feature branch: `git checkout -b feature/xyz develop`
+3. Commit your changes according to our commit message standards: `git commit -am 'feat(xyz) Added new functionality'`
+4. Push to your repo: `git push origin feature/xyz`
+5. Submit a pull request to `develop`
+
+## Workflow
+This repo uses Gitflow as its branch management system. You can learn more about Gitflow [here](https://www.atlassian.com/git/tutorials/comparing-workflows#gitflow-workflow).
+A few quick tips:
+* All feature branches should be based on `develop` and have the format `feature/branch_name`. 
+* Minor bug fixes should be based on `master` and have the format `hotfix/branch_name`.
+
+### Commit Conventions
+In order to make the changelog generation easier we recommend the use of messages based on [Conventional Commits](https://conventionalcommits.org/).
+
+Examples:
+```
+feat(orders): added `XYZ` helper function
+
+commit description
+
+footer notes
+```
+
+```
+refactor(orders): refactored `ABC` helper function
+
+The behaviour of `ABC` was inconsistent and (...)
+
+BREAKING CHANGE: return type of `ABC` is now `String`
+```