Add testing content

content/roadmaps/103-react/content/102-react-ecosystem/106-testing/100-jest.md

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 # Jest
+
+Jest is a delightful JavaScript Testing Framework with a focus on simplicity. It works with projects using: Babel, TypeScript, Node, React, Angular, Vue and more!
+
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
+<BadgeLink colorScheme='blue' badgeText='Official Website' href='https://jestjs.io/'>Jest Website</BadgeLink>

content/roadmaps/103-react/content/102-react-ecosystem/106-testing/101-react-testing-library.md

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-# React testing library
+# React Testing Library
+
+The React Testing Library is a very lightweight solution for testing React components. It provides light utility functions on top of react-dom and react-dom/test-utils, in a way that encourages better testing practices. Its primary guiding principle is: The more your tests resemble the way your software is used, the more confidence they can give you.
+
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
+<BadgeLink colorScheme='blue' badgeText='Official Getting Started' href='https://testing-library.com/docs/react-testing-library/intro/'>React Testing Library</BadgeLink>

content/roadmaps/103-react/content/102-react-ecosystem/106-testing/102-cypress.md

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 # Cypress
+
+Cypress framework is a JavaScript-based end-to-end testing framework built on top of Mocha – a feature-rich JavaScript test framework running on and in the browser, making asynchronous testing simple and convenient. It also uses a BDD/TDD assertion library and a browser to pair with any JavaScript testing framework.
+
+<ResourceGroupTitle>Free Resources</ResourceGroupTitle>
+<BadgeLink colorScheme='blue' badgeText='Website' href='https://www.cypress.io/'>Official Website</BadgeLink>
+<BadgeLink colorScheme='blue' badgeText='Docs' href='https://docs.cypress.io/guides/overview/why-cypress#Other'>Official Documentation</BadgeLink>
+<BadgeLink colorScheme='purple' badgeText='Watch' href='https://www.youtube.com/watch?v=7N63cMKosIE'>Cypress End-to-End Testing</BadgeLink>

content/roadmaps/103-react/content/102-react-ecosystem/106-testing/readme.md

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 # Testing
+
+A key to building software that meets requirements without defects is testing. Software testing helps developers know they are building the right software. When tests are run as part of the development process (often with continuous integration tools), they build confidence and prevent regressions in the code.
+
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.guru99.com/software-testing-introduction-importance.html'>What is Software Testing?</BadgeLink>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.browserstack.com/guide/testing-pyramid-for-test-automation'>Testing Pyramid</BadgeLink>