Add Gherkin to languages and frameworks (#23)

radar/languages-and-frameworks/gherkin.md

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+---
+title: "Gherkin"
+ring: trial
+quadrant: "languages-and-frameworks"
+tags: [testing]
+---
+
+[Gherkin](https://cucumber.io/docs/gherkin/reference/) is a domain-specific language designed for describing software behavior without detailing how that behavior is implemented. It serves as a collaboration tool between technical and non-technical team members.
+
+Gherkin is often used to write acceptance tests. In our case serves as the foundation for test automation. Tools (e.g. [behave](https://behave.readthedocs.io/en/latest/)) interpret Gherkin syntax to execute tests and verify that the software behaves as specified.
+
+Gherkin files can be used as living documentation for software projects. They provide a clear and concise representation of the expected behavior, aiding in requirements understanding and maintenance.
+
+### Key features:
+
+- **Human-Readable Syntax**:
+Gherkin uses a plain-text format that is easy to understand by both technical and non-technical stakeholders. This facilitates better collaboration and communication within cross-functional teams.
+
+
+- **Behavior-Driven Development (BDD)**:
+Gherkin is a central component of BDD methodologies, promoting collaboration between developers, testers, and business stakeholders. It allows the creation of executable specifications that ensure the development team delivers the expected functionality.
+
+- **Structured Format**:
+Gherkin scenarios are written in a structured format using keywords such as Given, When, Then. This structure provides a clear and consistent way to define the steps of a scenario, making it easy to follow and maintain.
+
+- **Tool Agnostic**:
+Gherkin is not tied to any specific programming language or testing tool. This agnosticism allows teams to use Gherkin with various BDD tools and frameworks, fostering flexibility and adaptability.
+
+### Our use cases:
+
+- [Test automation](https://github.com/pagopa/idpay-functional-testing): We use Gherkin as framework to automate funcional tests but its flexibility makes it suitable even for integration tests. At unit level the use of Gherkin can result in a proliferation of ad-hoc step definition, making the whole suite less maintainable. 
+
+- [Requirement Documentation](https://pagopa.github.io/idpay-functional-testing/): Given Gherkin syntax, We parsed feature files and presented their content as documentation on the currently tested scenarios.