Blog for auto-instrumenting a Python app

[AndrewHess]

Description

Using https://opentelemetry.io/docs/instrumentation/python/ as a reference, write a blog guiding someone with an existing Python app to use OpenTelemetry to auto-instrument it and view the traces in siglens. Also provide a minimal app that someone could use to go through this tutorial if they don't have an existing app.

You may want to look at the description of PR #38 which explains how to properly setup the endpoint so opentelemetry-demo can send traces to siglens.

Goals

• Write the blog as a markdown document in the siglens-docs repo in the docs/ folder (or a subfolder of that)
• Go through the steps yourself to ensure that they work and are easy to follow.