Add summary

Add Summary file

ESSIFI-46 improved interface specs.

Essifi 46

Also edited the link for the PE Library (was missing the "./"

Changed links in text to point towards functional specifications

Specifications are specified did not sound nice

- also added some stuff to make it look nicer

Will have to update the links to work within the gitlab repo since the summary will be at another location than the deliverables

ESSIFI-8 make the resources of REST API consistent

Small sentence changed

ESSIFI-8 PE REST API

Remove double GET

Small changes

ESSIFI-42 fixed link after the target file moved.

Update of the actions