Update README.md (#167)

Added an answer from a blog I wrote, I hope this is allowed, thank you for your consideration
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@ -12619,6 +12619,10 @@ From the official [docs](https://www.elastic.co/guide/en/elasticsearch/reference
<details>
<summary>What is Logstash?</summary><br><b>
From the [blog](https://logit.io/blog/post/the-top-50-elk-stack-and-elasticsearch-interview-questions):
"Logstash is a powerful, flexible pipeline that collects, enriches and transports data. It works as an extract, transform & load (ETL) tool for collecting log messages."
</b></details>
<details>