add reference to hermioslibs

Bugfixes
- i got an error while loading the game (Shoyun)[https://api.github.com/repos//issues/8]

take default collision box

Minor Features
- It is possible to build one underground substation above another one[https://api.github.com/repos//issues/6]

add thumbnail

Graphics
- Missing thumbnail[https://api.github.com/repos//issues/3]

init

Major Features
- First version[https://api.github.com/repos//issues/2]