Documenting how the connections is used to implement the tile features

[nadinengland]

Currently, tiles Features are implementing as an enum to represent the various types, and a connections field is provided on the few that touch the edges of the tiles (Roads, doesn't include all that are included in the base game. Specifically, we are missing:

A Feature of a Tile can touch zero, one, or more cardinal direction of the Tile. In the event it touches non, as in the case of a Monastery, it exists as a simple enum with no struct fields. However, in the case it does touch a direction, like a City, it contains a connections field which lists all the sides it touches.

The part of the above image is represented as follows:

• Bottom Left
  • Road: [North, East]
  • Field: [NorthNorthEast, NorthEastEast]
  • Field: [SouthEastEast, SouthWestWest, West, NorthWestWest, NorthNorthWest]
• Bottom Right
  • Road: [North]
  • Field: [NorthNorthEast, NorthEastEast, East, SouthEastEast, SouthSouthEast]
  • Road: [South]
  • Field: [SouthSouthWest, SouthWestWest]
  • Road: [West]
  • Field: [NorthWestWest, NorthNorthWest]

Note: roads that terminate in the centre are represented as only touching one Direction.

[nadinengland]

Pull request #4 change the directions from Cardinals to Simple Directions (e.g. Top, Left.) This reeds reflecting in the documentation.