added a security tool

nodejsscantool.md

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+I integrated the NodeJsscan static tool to check for security issues when needed. 
+Since it is a python build tool, I was not able to integrate it automatically to the workflow. 
+So to use it you have to install locally by running 'pip install njsscan' on your terminal. 
+After the tool is install run 'njsscan' to start using it. 
+You can test the security of a file by running 'njsscan <filepath>' on your terminal!
+Here is a link to the tool documentation: https://github.com/ajinabraham/njsscan#command-line-options