Complete README-instructions.md File

[hsr205]

Description: Create README-instructions.md that provides the user with the following information:

1. Instructions to test the deployed application on Render
2. Instructions to run the jest and cypress test cases.
3. Instructions to generate the coverage report for jest tests.
4. Instructions to generate the CodeQL report for your application's server.
5. Instructions to set environment variables that one may need to run any scripts or tests.