message: add info about java package installation
diff: @@ -58,6 +58,8 @@ You are able to download jar files directly from `release page <https://github.c
  cd brainflow
  mvn package
  +Also, you can use `GitHub Package <https://github.com/brainflow-dev/brainflow/packages/290893>`_ and download BrainFlow using Maven or Gradle.
  +To use Github packages you need to `change Maven settings <https://help.github.com/en/packages/using-github-packages-with-your-projects-ecosystem/configuring-apache-maven-for-use-with-github-packages>`_. `Example file <https://github.com/brainflow-dev/brainflow/blob/master/java-package/brainflow/settings.xml>`_ here you need to change OWNER and TOKEN by Github username and token with an access to Github Packages.
  Matlab
  --------
  