Updated preview images and added guide to doing so

android/assets/game.atlas

@@ -97,7 +97,7 @@ ImprovementIcons/Citadel
   index: -1
 ImprovementIcons/City center
   rotate: false
-  xy: 4, 182
+  xy: 1362, 1944
   size: 100, 100
   orig: 100, 100
   offset: 0, 0
@@ -221,6 +221,20 @@ ImprovementIcons/Quarry
   orig: 100, 100
   offset: 0, 0
   index: -1
+ImprovementIcons/Railroad
+  rotate: false
+  xy: 1149, 1404
+  size: 100, 100
+  orig: 100, 100
+  offset: 0, 0
+  index: -1
+TileSets/Minimal/Railroad
+  rotate: false
+  xy: 1149, 1404
+  size: 100, 100
+  orig: 100, 100
+  offset: 0, 0
+  index: -1
 ImprovementIcons/Road
   rotate: false
   xy: 1905, 1404
@@ -5387,20 +5401,6 @@ TileSets/Minimal/Arrows/UnitHasAttacked
   orig: 100, 60
   offset: 0, 0
   index: -1
-TileSets/Minimal/Railroad
-  rotate: false
-  xy: 1149, 1404
-  size: 100, 100
-  orig: 100, 100
-  offset: 0, 0
-  index: -1
-ImprovementIcons/Railroad
-  rotate: false
-  xy: 1149, 1404
-  size: 100, 100
-  orig: 100, 100
-  offset: 0, 0
-  index: -1
 TileSets/Minimal/Road
   rotate: false
   xy: 404, 1775
@@ -5417,7 +5417,7 @@ TileSets/Minimal/Tiles/Atoll
   index: -1
 TileSets/Minimal/Tiles/City center
   rotate: false
-  xy: 1362, 1944
+  xy: 4, 182
   size: 100, 100
   orig: 100, 100
   offset: 0, 0

docs/Developers/Generating-screenshots.md

@@ -0,0 +1,22 @@
+# Generating Screenshots
+
+Images are the first way that a player viscerally connects to the game,
+and so making our screenshots better leads to a direct increase in interest.
+
+For us to continue to generate screenshots as the UI improves, we have a saved game named "ScreenshotGenerationGame" in the extraImages folder.
+
+The easiest way to create screenshots is by:
+- WRITE DOWN which file you're working on! They all look the same!
+- Editing the gamesettings.json to the required height/width
+- Loading the ScreenshotGenerationGame
+- Centering on Elephantine
+- Selecting the top-right Keshik, then clicking on Elephantine
+- Screenshotting the entire window
+- Cropping the area off the top (I use Shutter on Ubuntu for the above 2 steps)
+- Save!
+
+Quick dimensions checklist for y'all!
+
+- Github preview image - 1280*640
+- Feature Graphic - Google Play - 1024*500 - best in 900x600 resolution (options - display)
+- Itch.io image - 630*500 - best in 1050x700 resolution