[docs] Update chusan docs

docs/dev/chusan_dev_notes.md

@@ -0,0 +1,34 @@
+# Chusan dev notes
+
+## Item types
+| ItemKind |       Name        | Single / Multiple |             Notes             |
+|----------|-------------------|-------------------|-------------------------------|
+|    1     |  Nameplate        |      Single       |               -               |
+|    2     |  Frame            |      Single       |               -               |
+|    3     |  Trophy           |      Single       |               -               |
+|    4     |  Skill            |      Multiple     |     Stock is level of skill   |
+|    5     |  Ticket           |      Multiple     |               -               |
+|    6     |  Present          |      Multiple?    |               -               |
+|    7     |  Music (Unlock)   |      Single       |               -               |
+|    8     |  Map Icon         |      Single       |               -               |
+|    9     |  System Voice     |      Single       |               -               |
+|    10    |  Symbol Chat      |      Single       |               -               |
+|    11    |  Avatar Accessory |      Single       |Part can determined by category|
+
+## Avatar accessory category
+|  Category ID  | Part name |
+|---------------|-----------|
+|       1       |    Wear   |
+|       2       |    Head   |
+|       3       |    Face   |
+|       4       |    Skin   |
+|       5       |    Item   |
+|       6       |    Front  |
+|       7       |    Back   |
+
+## National matching
+- Can be disabled dynamically on GetGameSettingHandler
+- NAT hole punching, direct connection between cab to cab?
+- Session management required
+- Fallback to CPU competitors if conditions met
+- ReflectorUri, Related?

docs/game_specific_notes.md

@@ -32,7 +32,8 @@ Only JP variant is supported.
 * Match `game.chusan.version` and `game.chusan.rom-version` key in `application.properties` same as your client. If not, class mode is disabled due to version mismatch.
 * Team function can be enabled by changing `game.chusan.team-name` value. Leave this blank to disable team function.
 * Chusan and Chunithm uses different endpoints and tables. Your progress from Chunithm won't carry over to Chusan.
-* User box customization requires Web UI, which is not added yet. The only option to do now is editing database.
+* For user box customization, use Web UI.
+* (For New plus or up) Class mode disabled when game set to free play. This not server restriction.
 
 ## Chunithm
 Only JP variant is supported.