added bam-sensornet metadata sample

[leonewashoe]

This is an example of a metadata structure for one system, including a data reader/transmitter and 5 sensor nodes (devices that will be embedded in the drum, each node has a temperature/humidity and temperature/pressure sensor).

The first level is a generic description of the whole system, it is possible to describe the main components under "devices". In this case, one type of device is the sensornode: the sensors included in one node have been briefly described, and it is possible to include some other parameters, but I wouldn't do that unless strictly required for data handling. The locations of the nodes have been described in cylindrical coordinates (empty at the moment). Of course, a description of the reference system is needed, but it is something that I would redirect to the documentation since it requires a picture to be easily understood. FYI the reference point to describe the height of the reference frame's origin and the polar axis will be marked by the position of the data reader, which will be stuck in a precise location on the external face of the drum.

The other type of device is the reader, just some versioning info and networking parameters have been included at the moment, but it won't require a nested structure if some other parameters will be added.

We can discuss this example first and then work on the schema.

[leonewashoe]

There's not a schema at the moment for this example, it's just a proposal of a metadata structure that could fit my system (and probably others). I didn't follow any already existing schema to develop this. If there is a schema already decided and fixed, I can create an example based on it, but I thought we were still in the phase to discuss the structure.

[leonewashoe]

I added a schema and an example for the sensing system I'm developing at BAM. I removed the file _bam_metadatasample since the structure is changed.

I added also a sample for the facility metadata structure that could be a starting point to discuss.

In the examples, some fields are empty or just placeholders.

[gdmiron]

I think this is OK. We will have different metadata for each setup, where possible we use one or common.

[gdmiron]

you can merge, I will later add your examples to the automatic test.

[leonewashoe]

Ok, I'm going to merge. Maybe after that, we could adapt the sensor.json schema to be included in the __embedded_sensornet.json__ or any other system.