Update Security Testing (#2088)

content/roadmaps/113-qa/content/100-qa-basics/107-testing-techniques/101-non-functional-testing/security-testing.md

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-# Security testing
+# Security Testing
+
+Security Testing is a type of Software Testing that uncovers vulnerabilities, threats, or risks in a software application and prevents malicious attacks from intruders. The purpose of Security Tests is to identify all possible loopholes and weaknesses of the software system which might result in a loss of information, revenue, repute at the hands of the employees or outsiders of the organization.
+
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.guru99.com/what-is-security-testing.html'>What is Security Testing? Types with Example</BadgeLink>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://brightsec.com/blog/security-testing/'>Security Testing: Types, Tools, and Best Practices</BadgeLink>