Feature/add nodered dashboard

[jpchemla]

I suggest to add a folder "nodered-dashboards" with simple examples using different protocols. A first one is opc ua.

[azoitl]

@jpchemla thx for your Pr. This is truly amazing. I had a different file structure in mind but I like yours a lot.

There are a few things that I have to point out. In order that we can accept your PR we have to follow a few things that is defined in the Eclipse Development process. This process protects you and us. The things that are currently missing are:

1. you need to create an Eclipse account, link your Eclipse account with your github account and sign the Eclipse Contributor Agreement. With this you say that you developed the provided code, that you have the permission to give us the code and that we are allowed to use your code under the Eclipse Public License V2.
2. All files that have copyright value need to have a copyright header.

All this is documentation in our contributing guidelines: https://eclipse.dev/4diac/doc/development/contribute.html
I'm currently reworking that document to make it a bit more approachable. However it is not in state to share yet.

[azoitl]

@jpchemla by now I have a first version of an updated contributing guideline: eclipse-4diac/4diac-documentation#93

[jpchemla]

@azoitl thank you for your contributing guideline. I found how to resolve the link issue between my GitHub account and the Eclipse one. I guess it is Ok now.

[azoitl]

@jpchemla please also at a copyright notice to the IEC 61499 system file. You can look at the other examples or the type lib FBs for reference.

Does Node-RED allow that we have a copyright header in the flow.json file?