Update Docu

[wurzka]

Mention the reusable interface
Naming Convention
New Annotations
Updated example

[larshp]

A: file naming, suggest adding information as to what a "object type" is, personally I assume its a R3TR object, see #115
B: "Extreme Values", is this feature needed? I expect the schema generation to be based on the ABAP types
C: "Length Specification", is this feature needed? I expect the schema generation to be based on the ABAP types
D: "Default", is this feature needed? I expect the schema generation to be based on the ABAP types update: for types I guess its not possible to define a default, anyhow, suggest deferring and opening an issue for it, this is nice-to-have

I suggest prioritizing getting the schema generation running/automated first, instead of adding more features

[wurzka]

See #144. There is talked about the need for the new annotation.

[larshp]

heh, okay, I don't follow any of the new format files, only INTF + CHKO

[schneidermic0]

Relates to #128, but won't closes it until the interface names have been adapted

[schneidermic0]

Thanks, LGTM.