Introduce a compatibility chart in readme.md

[mvysny]

Currently there are multiple releases of MPR: 2.0.5, but also 3.0.2 and 4.0.0 (see https://github.com/vaadin/multiplatform-runtime/tags ), yet it's not clear which version is compatible with which Vaadin 8/14/17 version. This information is present at https://vaadin.com/docs/v10/mpr/introduction/step-1-maven-v8.html but it's hopelessly outdated (uses MPR 1.1.1 at the time of writing).

Could you please make this information public in README.md? A chart akin to https://github.com/vaadin/vaadin-gradle-plugin/#compatibility-chart would help tremendously.

[pleku]

The MPR version is managed by vaadin-bom for the users. So when they use that, they get the correct version always.
https://github.com/vaadin/platform/blob/master/versions.json#L76

I don't see the added value of adding the readme just for one project as it would be outdated like documentation which to you refer to - we simply will not keep updating documentation for old platform versions.

[pleku]

I was wrong, the fact is even said in the very beginning of the linked documentation for v10 so it is not outdated

Starting from Vaadin 12, MPR is part of the Vaadin Platform, so the supported version of the project is set for you when importing the plaform in your project. In other words, you only need to define the platform version:

[mvysny]

Thank you, that's excellent to know. In such case I think it would be beneficial for anybody interested to use MPR to have exactly the information stated in the README.md.

[mvysny]

#79