request: add more docs

[nes-girl]

Hi

I'm a beginner with this library. Could you please provide in the docs a Tiled example map that has:

• different tile types: grass, water, stone, ...
• collision layer
• ...

Then provide a full code example using DotTiled to load the map and show code to get the tile type and handle collisions? Basiczally a full code example showing all features of DotTiled on an example Tiled map.

thx

[nes-girl]

Please use latest Tiled version for this