[DOC] Added docker-compose.yml to configure caddy as a reverse proxy

[Tusharjamdade]

• Closes Adding example caddy file as an alternative to nginx #263

Changes proposed in this pull request:

• Added docker-compose.yml to configure caddy as a reverse proxy.
• Added an example Caddyfile.

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[Tusharjamdade]

Hi @rmanaem,
I am slightly unsure about the changes, as this is my first time working with the document. Please let me know if any additional changes or improvements are required.