README.md: update quick start with description of a Makefile (brisbanesocialchess#428)

* README.md: update quick start with description of a `Makefile`

* Update README.md

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

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Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: jbampton

README.md

@@ -85,6 +85,8 @@ Experiment with Lerna and bootup a local developer playground from the repositor
 
 [Docker](https://www.docker.com/) is an open-source platform designed to simplify the process of building, deploying, and running applications using containerization. It packages an application and all its dependencies (libraries, system tools, code, runtime) into a standardized unit called a "container."
 
+[Makefile](https://en.wikipedia.org/wiki/Makefile) is a text file that contains a set of instructions used by the [make](https://en.wikipedia.org/wiki/Make_(software)) utility to automate the process of building and managing software projects. It defines dependencies between files and specifies the commands required to update outdated files or generate new ones.
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 ### Cloudflare Workers Development
 
 To work with the Cloudflare Workers site in the `packages/cfsite` directory: