🔧 Create CONTRIBUTING.md

CONTRIBUTING.md

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+## Contributing
+
+This project is released under the MPL 2.0 license.
+Before implementing new features and changes, feel free to [submit an issue](https://github.com/CollabCodeTech/collabcodetraining-api-email/issues/new). We're going to talk here :stuck_out_tongue_winking_eye:.
+
+### Code of Conduct
+
+This project adheres to the Contributor Covenant [code of conduct](CODE_OF_CONDUCT.md). By participating, you are expected to uphold this code. Please report unacceptable behavior to [[email protected]](mailto:[email protected]).
+
+### Issues and Questions
+
+We have an official [Discord](https://discord.gg/YeeEAYj) server where we can give helpful advices if you have questions.
+
+## How to submit a pull request?
+
+1. Fork [this repository](https://github.com/CollabCodeTech/collabcodetraining-api-email/fork).
+2. Create a new branch with the feature name. (Eg: feature/chat-support, hotfix/website-header)
+3. Make your changes.
+4. Commit your changes. Please follow the [styleguides](#styleguides)
+5. Push your changes.
+6. Submit your pull request.
+
+We use [GitFlow](https://nvie.com/posts/a-successful-git-branching-model/) so unless your PR is a `hotfix`, your feature branch must be created from the `develop` branch.
+
+**TIP:** This [Git extension](https://github.com/nvie/gitflow) makes Git Flow a piece of cake. GitKraken also has [built-in support](https://support.gitkraken.com/git-workflows-and-extensions/git-flow/) for GitFlow
+
+## Styleguides
+
+### Git Commit Styleguide
+
+- Use the present tense ("Add feature" not "Added feature")
+- Use the imperative mood ("Move cursor to..." not "Moves cursor to...")
+- Limit the first line to 72 characters or less
+- Reference issues and pull requests liberally after the first line
+- Consider starting the commit message with an applicable emoji:
+  - :art: `:art:` when improving the format/structure of the code
+  - :zap: `:zap:` when improving performance
+  - :pencil: `:pencil:` when writing docs
+  - :penguin: `:penguin:` when fixing something on Linux
+  - :apple: `:apple:` when fixing something on macOS
+  - :checkered_flag: `:checkered_flag:` when fixing something on Windows
+  - :bug: `:bug:` when fixing a bug
+  - :fire: `:fire:` when removing code or files
+  - :green_heart: `:green_heart:` when fixing the CI build
+  - :white_check_mark: `:white_check_mark:` when adding or updating tests
+  - :lock: `:lock:` when dealing with security
+  - :arrow_up: `:arrow_up:` when upgrading dependencies
+  - :arrow_down: `:arrow_down:` when downgrading dependencies
+  - :rotating_light: `:rotating_light:` when removing linter warnings
+- Full emoji reference in [gitmoji](https://gitmoji.carloscuesta.me/)