[DOCS] Instrument C++ Application to send Traces

[Calm-Rock]

Scope of Task

Documentation
We need documentation that explains how to instrument a C++ application to send traces to SigNoz using OpenTelemetry. The documentation should cover configuration steps for both SigNoz Cloud and self-hosted SigNoz, with instructions for the following environments:

• VM (Virtual Machines)
• Kubernetes
• Windows

Sample Application
Create a sample application that is already instrumented or tell steps to instrument in the README file.

• Should include instructions for running the app and instrumenting the app if not already instrumented
• Should include a docker file

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Additional Things

Documentation

• Include explanation for all the code blocks
• Include images for the final output
• Create two tabs for Cloud and Self-Hosted instructions

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Where should the doc go ?

• Create a new .mdx file in this folder
  - Name the file opentelemetry-cpp.mdx
  - The id in the metadata should be opentelemetry-cpp

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Resources

• OpenTelemetry C++ Docs
• OpenTelemetry C++ GitHub
• Relevant articles - here and here

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Please follow the contribution guidelines that were shared with you