Add DevSecOps demo feature page and setup

Added a new DevSecOps demo feature page with content and backend logging implementation. Included necessary package installations and created a new feature branch.

Author: CalinL

specs/devsecops-new-feature-demo.md

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+Use the gh-advsec-devsecops repository from the workspace
+Create a new DevSecOps-[random-number].cshtml page and reference it into the Index page
+Add some content to it with some latest news about GitHub Advanced Security.
+Implemented the ILogger for the backend code of the page.
+For demo purpose, generate some C# insecure code, like log forging or regex exposure
+Add package System.Text.Json --version 8.0.4
+Add package  Microsoft.Data.SqlClient --version 5.0.2
+Add package newtonsoft.json --version 12.0.2
+Build the webapp to make sure there are not build errors.
+Create me a new branch feature/devsecops-demo-[randon-number] and switch to it.
+Prepare for committing the changes.