Integrated: Update the readme to include IntelliJ setup instructions

[Robin Westberg]

On Tue, 2 Feb 2021 13:37:38 GMT, Robin Westberg <rwestberg at openjdk.org> wrote:

> Adds a section on how to build and test Skara using IntelliJ IDEA.

This pull request has now been integrated.

Changeset: 3c18e067
Author:    Robin Westberg <rwestberg at openjdk.org>
URL:       https://git.openjdk.java.net/skara/commit/3c18e067
Stats:     15 lines in 2 files changed: 13 ins; 0 del; 2 mod

Update the readme to include IntelliJ setup instructions

Reviewed-by: ehelin

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PR: https://git.openjdk.java.net/skara/pull/998