added README.md

Author: tisoft

README.md

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+
+# SAIC Java API
+
+Implementation of the SAIC API in Java.
+
+
+## Badges
+
+[![MIT License](https://img.shields.io/badge/License-MIT-green.svg)](https://choosealicense.com/licenses/mit/)
+
+![Maven Central](https://img.shields.io/maven-central/v/io.github.saic-ismart-api/saic-ismart-api-parent)
+
+![GitHub Workflow Status (with event)](https://img.shields.io/github/actions/workflow/status/SAIC-iSmart-API/saic-java-client/maven.yml)
+
+## Usage
+
+[MQTT Gateway](saic-java-mqtt-gateway)
+
+
+## Build locally
+
+Clone the project
+
+```bash
+git clone [email protected]:SAIC-iSmart-API/saic-java-client.git
+```
+
+Go to the project directory
+
+```bash
+cd saic-java-client
+```
+
+Build and test
+
+```bash
+./mvnw clean verify
+```
+
+Skip docker image creation
+
+```bash
+./mvnw clean verify -Djib.skip
+```
+## Contributing
+
+Contributions are always welcome!
+