add basic usage instructions

docs/INSTRUCTIONS.md

@@ -17,7 +17,34 @@ I'll try to keep these links up-to-date:
 - Mac (seems to have a HiDPI bug, text is offset):
   https://github.com/dabreegster/abstreet/releases/download/v0.1.10/abstreet_mac.zip
 
-### Compiling from source
+## Running the game
+
+Start the game by running `play_abstreet.sh` or `play_abstreet.bat`. On Windows,
+you'll probably get a warning about running software from an unknown publisher.
+
+General controls:
+
+- Click and drag to move
+- Scroll wheel or touchpad to zoom
+- Menus should work as expected. Most actions have a keybinding.
+- You can hover over an object and right-click to see more actions.
+
+Things to try:
+
+- In sandbox mode, hover over an intersection, right click, and spawn agents.
+  Then you can start the simulation by pressing **space** to "resume".
+- To run a realistic, full day's worth of traffic, go to sandbox mode and "reset
+  sim" if needed. Then "start a scenario" and choose the "psrc" entry (this
+  needs a better name). Time (shown in the top-right corner) starts at midnight.
+  Things tend to get interesting around 6am. Try zooming in for details, and
+  zooming out to see an overview.
+- Go to edit mode (note this will reset the simulation). Pick a lane, right
+  click, and change it to another type. You can also change which roads see a
+  stop sign by right clicking the intersection, choosing to edit, hovering over
+  a stop sign, and pressing **space** to toggle it. You can do the same for
+  intersections with traffic signals.
+
+## For developers: Compiling from source
 
 To build, you need a Linux-like environment with `bash`, `wget`, `unzip`, etc.
 You also `osmosis` for the import script. At runtime if you want to use the
@@ -42,19 +69,6 @@ cd game
 cargo run --release
 ```
 
-## Running the game
-
-Start the game by running `play_abstreet.sh` or `play_abstreet.bat`. On Windows,
-you'll probably get a warning about running software from an unknown publisher.
-
-General controls:
-
-- Click and drag to move
-- Scroll wheel or touchpad to zoom
-- Follow on-screen controls otherwise. You can also try hovering over an object
-  and right-clicking to see more actions. (These controls will show up more
-  clearly soon.)
-
 ## Data source licensing
 
 A/B Street binary releases contain pre-built maps that combine data from:

game/src/splash_screen.rs

@@ -125,10 +125,10 @@ fn splash_screen(
     let sandbox = "Sandbox mode";
     let load_map = "Load another map";
     let edit = "Edit map";
-    let tutorial = "Tutorial";
-    let debug = "Debug mode";
-    let mission = "Mission Edit Mode";
     let abtest = "A/B Test Mode";
+    let tutorial = "Tutorial (unfinished)";
+    let debug = "Debug mode";
+    let mission = "Internal developer tools";
     let about = "About";
     let quit = "Quit";
 
@@ -144,10 +144,10 @@ fn splash_screen(
                 Choice::new(sandbox, ()).key(Key::S),
                 Choice::new(load_map, ()).key(Key::L),
                 Choice::new(edit, ()).key(Key::E),
+                Choice::new(abtest, ()).key(Key::A),
                 Choice::new(tutorial, ()).key(Key::T),
                 Choice::new(debug, ()).key(Key::D),
                 Choice::new(mission, ()).key(Key::M),
-                Choice::new(abtest, ()).key(Key::A),
                 Choice::new(about, ()),
                 Choice::new(quit, ()),
             ]
@@ -184,10 +184,10 @@ fn splash_screen(
             }
         }
         x if x == edit => Some(Transition::Push(Box::new(EditMode::new(ctx, ui)))),
+        x if x == abtest => Some(Transition::Push(PickABTest::new())),
         x if x == tutorial => Some(Transition::Push(Box::new(TutorialMode::new(ctx, ui)))),
         x if x == debug => Some(Transition::Push(Box::new(DebugMode::new(ctx, ui)))),
         x if x == mission => Some(Transition::Push(Box::new(MissionEditMode::new(ctx, ui)))),
-        x if x == abtest => Some(Transition::Push(PickABTest::new())),
         x if x == about => {
             if wizard.acknowledge(
                 "About A/B Street",