Added readme

Author: ariostas

README.md

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+# Intro to `git`
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+This repository contains the material used for the `git` workshop at the 2025 HSF/IRIS-HEP Software Basics Training at CERN. The material is based on the `git` portion of the [Software Engineering for Scientific Computing Course](https://henryiii.github.io/se-for-sci/content/intro.html) and the [git Course](https://hsf-training.github.io/git-novice/) by the [HEP Software Foundation](https://hepsoftwarefoundation.org/).
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+The live slides can be found [here](https://ariostas-talks.github.io/2025-06-18-intro-to-git).