Make README up-to-date

[MartinKanters]

The README is currently quite outdated, as it even states that you have to build the library yourself.
Also, I think it would be best to stop focussing so much on the encryption, since probably a lot of potential consumers might not handle sensitive data.
The How To should probably be a bit higher up as well, to ensure people can see how it works in one glance.

Could you please make it up to date? :)

[erwinc1]

Heya @MartinKanters can you re-evaluate, please? There have been changes since this issue was created :)

[MartinKanters]

Sure @erwinc1 !

I think it's definitely improved, but perhaps the following things can be changed:

• There are two Getting Started's and the content is very similar. I think it's best to remove the first block.
• The first point of the 2nd getting started can be removed (that's saying that you have to build the lib yourself)
• The README says in multiple places that it's required to setup keys to get insight in the data-comparison. This will have a demotivational effect on the reader, since it's usually not very easy to set up and use. Your team also introduced the NoopEncryptionService which allows to see the data difference without setting up keys. I'd definitely put that in the README as well.

[MartinKanters]

Nice job! Looks much better like this! 👍