Add simple examples to README.md

[ikhoon]

README.md could be a gentle guide for users to start centraldogma-python for the first time.

Examples:
https://github.com/line/centraldogma-go
https://github.com/line/centraldogma-rs

[hexoul]

Nice issue. Is 0.1.1 right version you intended?

[ikhoon]

We can update the document later after the first release.
I think we need to do that before we make an announcement on Twitter or other social media for the first time
so that users get a nice impression from our projects.

[ikhoon]

Let me remove the milestone away because it is not a mandatory task for the initial release.

[hexoul]

Agreed 👍