Better explain game in Readme

[rugk]

Not knowing this project after reading the Readme there are still some open questions:

1. This screenshot only shows me some triangles… What does it mean? (according to the idea there are other objects too, you should also depict them)
2. How does one defeat the other one?
3. How is the gameplay?
4. …

Also you should show the elements of this sentence is a screenshot:

Two units (represented as triangles) can be combined to a building (a square). In that form, they cannot attack anymore, but have a defense bonus.

[rnestler]

Thanks for the input! The thing is, I don't really have a workable gameplay yet, it's still just a prototype and some ideas.
But I should really put some time into developing and explaining the gameplay in the Readme.