Feat/env example in apps sim

[sundaram2021]

Summary

Brief description of what this PR does and why.

Fixes #(1835)

Type of Change

• [ ] Bug fix
• [ x] New feature
• [ ] Breaking change
• [x ] Documentation
• [ ] Other: ___________

Testing

How has this been tested? What should reviewers focus on?

Checklist

• [ ] Code follows project style guidelines
• [ ] Self-reviewed my changes
• [ ] Tests added/updated and passing
• [ ] No new warnings introduced
• [ ] I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

Screenshots/Videos

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[waleedlatif1]

@sundaram2021 there is already a .env.example in apps/sim/app

[sundaram2021]

@sundaram2021 there is already a .env.example in apps/sim/app

right , my branch was not updated previously.