Improvements to the README.md

[tatiana]

There are still a couple of improvements that we could make, which can be addressed in a separate PR:

• links to examples and code could be embedded, as opposed to links
• we need to do more work on the quickstart - allowing users to try out with minimum setup, steps and an example that would work for anyone out-of-the-box
• render the supported databases / object stores in a more user-friendly way

[tatiana]

Over all LGTM.

I have few open questions though:

• Do you think we should add the cross database transfers example as well in read the docs?
• Do you think we should this example as well: f3caa09 I feel we could introduce example DAG section and add it there.

I'm happy to add those, please, feel free to suggest where you think they'd be better placed!

[tatiana]

@sunank200 @utkarsharma2 thanks for the reviews - I tried to address the feedback.

In the case of the example DAGs, I added a link to our example DAGs directory. I also tried to make it explicit what types of transfer we currently support (object store -> database, database -> object store, database -> database).

Please, let me know your thoughts