Multi-arch docker image support

Introduces Multi-arch docker image support for amd64/arm64

Initial release with docker support and documentation

What's Changed

• Add docker support by @onmomo in #1
• Multiplatform docker support by @onmomo in #2
• add cron support by @onmomo in #3
• update docs by @onmomo in #4

Full Changelog: https://github.com/onmomo/meteoswiss-api-client/commits/v1.0