Increased clarity of readme file

[rfuehrer]

The readme must be divided into different files in order to increase the readability and acceptance of the reader. For example, the installation or test notes can be offloaded to separate files. The readme then lists sections that indicate the separate files. These files can be stored in the /docs directory.

[rfuehrer]

possible seperations are:

• architecture
• installation
• test
• deployment
• expandability

[rfuehrer]

Further note: at the latest in this process also correct the title according to the repo name "Github Webhooks Framework"