Add a proper readme.

README.md

@@ -1,10 +1,85 @@
-# WACCA Launcher
+# WACCA Launcher
 
-If you can't figure out how to use this, it's probably not for you.
+Allows you to run multiple versions of WACCA from the same drive.
+
+## Configuration
+
+You'll want a directory structure something like this:
+
+```
+WACCA/
+├── WACCALauncher.exe
+├── wacca.ini
+└── Versions/
+    ├── WACCA/
+    │   ├── bin/
+    │   └── ...
+    ├── WACCA S
+    ├── Lily
+    ├── Lily R
+    ├── Reverse
+    ├── Offline
+    └── Omega Supermix Deluxe
+```
+
+Each version must have segatools already configured, with a `start.bat` file present.
+
+You'll want to create a `wacca.ini` file next to the launcher that looks something like this:
+
+```
+[general]
+default_ver = reverse
+
+[versions]
+wacca = C:\WACCA\Versions\WACCA
+wacca_s = C:\WACCA\Versions\WACCA S
+lily = C:\WACCA\Versions\Lily
+lily_r = C:\WACCA\Versions\Lily R
+reverse = C:\WACCA\Versions\Reverse
+offline = C:\WACCA\Versions\Offline
+```
+
+Versions can be omitted, but all paths provided must be valid.
+
+If you have a custom version of the game you wish to launch, you may do so by adding
+`num_customs = 1` under `[general]`, and then adding a block at the end of the file
+that looks something like this:
+
+```
+[custom_1]
+name = WACCA Omega Supermix Deluxe
+path = C:\WACCA\Versions\Omega Supermix Deluxe
+type = reverse
+
+```
+
+`type` must match one of the versions listed above, it will likely be `reverse` unless specified.
+
+## Usage
+
+When you start the launcher, you will be presented with a loading prompt.
+You may press `TEST` or <kbd>Esc</kbd> to open the configuration menu. This menu allows you
+to change the default startup version, as well as launch a version manually.
+This menu is controlled in the same way you would navigate the in-game test menu.
+
+If you do not interfere with the loading prompt, the selected default version
+will be launched within 5 seconds.
+
+## Auto-launch
+
+You can configure your cab to start the launcher instead of explorer.exe when you log in.
+**This should only be done on a cab. You have been warned.**
+
+If you've installed the launcher in the suggested location of `C:\WACCA`,
+you can run `SetShell.reg` to reconfigure your registry accordingly. 
+
+If you have not installed the launcher in the suggested location, you will need to edit the
+registry file before you apply it. **This is important, if the path is invalid, you may get
+softlocked on a black screen at next boot!**
 
 ## Notice
 
-This code was never intended to be public, as such, it is a dumpster fire.
+This code was never intended to be public, as such, it is a bit of a dumpster fire.
 If you want to help make the code a little less awful, issues and pull requests are welcome.
 
 ## License