Update .NET manual instrumentation docs with example app

[IAMebonyhope]

This is to solve the .Net aspect of this issue #3229
Completed the Example App, Setup and Traces section.

I can add metrics and logs in another PR.

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: IAMebonyhope / name: Hope Oluwalolope (7594701, a977d67, 2cb9cd0, 7dc7ffc, 39733f8, dbbf6f7, 55ec3a0, d3580d6, f5f71b9, 3fdd65f, 610a060, f75bdbd, 02afc00, 996dc8a, 8ead5ef, fff5bc5, 6ae0416, 5ea327f, 90b7a96, 2d36d21, 020f5d4, d84d5ca, 4d02369, 505bcf9)
• ✅ login: svrnm / name: Severin Neumann (4ab7355, 102e258, da78f9c, a4cf770)

[svrnm]

thanks for kicking this off @IAMebonyhope !

Here's the preview: https://deploy-preview-3834--opentelemetry.netlify.app/docs/languages/net/instrumentation/

cc @open-telemetry/docs-approvers , @open-telemetry/dotnet-approvers

[theletterf]

Thanks! Some language and formatting suggestions.

[martinjt]

It's definitely looking good @IAMebonyhope! Added some comments, feel free to tag me if you have more!

[svrnm]

@IAMebonyhope anything you need to move this forward?

[IAMebonyhope]

@IAMebonyhope anything you need to move this forward?

@svrnm I'll work on resolving the comments this week

[IAMebonyhope]

Pushed a new iteration and responded to comments @svrnm

@cijothomas @reyang please can you take another look?

[cijothomas]

Suggested change

	// Create a service to expose the ActivitySource Instruments.
	// Create a service to expose the ActivitySource.

Unless you plan to add metric instruments as well to Instrumentation.cs?

[IAMebonyhope]

Removed that line and updated the above comment.

[cijothomas]

Thanks. Left some more comments, but okay to address them as follow ups.

All changes applied

[svrnm]

Thanks @IAMebonyhope for all the effort put into this! I merged the PR and this should be live in a minute. I will also create a few follow up issues on the remaining non-blocking feedback