feat(README): Add Readme

README.md

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+# mbtci-python
+This repository contains a Dockerfile for building a Docker image based on [`devxci/mbtci-java21-node22`](https://hub.docker.com/r/devxci/mbtci-java21-node22) ([source](https://github.com/SAP/cloud-mta-build-tool/blob/master/Dockerfile_mbtci_template)) with Python installed from source. The image includes Python 3 and `pipx` for managing Python applications in isolated environments.
+
+## Features
+- Base image: `devxci/mbtci-java21-node22`
+- Python 3 installed from source
+- `pipx` installed for managing Python applications
+- Automated dependency updates with Renovate
+
+## Usage
+```
+docker pull ghcr.io/app-autoscaler-ci-bot/mbtci-python:latest
+```