introduce types (Typescript)

akzeptanzkriterien

• introduce d.ts file
• create common Types
• add types in project

added Frontend label

assigned to @hh062

mentioned in commit aacae3e3

mentioned in commit c07c3efd

stardeveloper

mentioned in commit 09e8a360

mentioned in commit 5b42d20e

mentioned in commit aaa84ec8

marked this issue as blocking #40 (closed)

removed the relation with #40 (closed)

mentioned in commit 7f53ce21