Add packaging and data layer definition drafts

Signed-off-by: Pierre R. Mai <pmai@pmsf.de>

Author: pmai

doc/architecture/data_layer.adoc

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 = Data layer
 
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+The data layer of OSI resides in the message specifications given using the ProtoBuf IDL.
+It defines the data that can be transmitted using OSI, including the structure and semantics of the data.
+
+As a second part it also specifies the encoding(s) to be used when transmitting OSI data.
+Currently this is the ProtoBuf encoding, but other encodings can be supported from the same IDL, with FlatBuffer encoding a currently experimental feature.
+
+The data layer does not directly define components and transmission routes, which are relegated to the packaging layer of OSI.
+There can be many packaging layer implementations using the common data layer definitions.
+This also enables easy bridging of information between components using different packaging layer implementations, since the data being exchanged remains compatible.

doc/architecture/packaging_layer.adoc

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 = Packaging layer
 
-Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
-Et malesuada fames ac turpis egestas.
-Mauris pharetra et ultrices neque ornare aenean euismod elementum nisi.
-Nulla facilisi morbi tempus iaculis urna id. Justo eget magna fermentum iaculis.
-Sed augue lacus viverra vitae congue eu. Velit ut tortor pretium viverra suspendisse.
-Amet commodo nulla facilisi nullam vehicula ipsum a. Nibh nisl condimentum id venenatis a.
-Diam vel quam elementum pulvinar etiam non quam lacus suspendisse.
+The packaging layer of OSI specifies the way that components (e.g. models) employing the OSI data layer can be packaged in order to achieve easy interoperability.
+
+It specifies model types (e.g. sensor model, traffic participant model), together with mandatory and optional OSI inputs, outputs, parameter interfaces.
+It also specifies specific component technology standards to allow encapsulation of those model types in easily exchangeable component packages, that allow use across platforms and implementations.
+
+Multiple packaging layer implementations are possible within the OSI framework, with the common data layer ensuring ease of bridging between multiple implementations.
+The current centrally defined packaging layer is the OSI Sensor Model Packaging (OSMP) specification.
+It is defined based on FMI 2.0 and certain additional conventions to allow packaging of OSI using models as FMUs.