Add license and documentation

LICENSE

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+Copyright (c) 2023-present Terry Hearst
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# Marble It Up! Ultra Console Unlocker
+
+This is a mod of [Marble It Up! Ultra](https://marbleitup.com/) which allows you to access the in-game console, which is useful for logging exact scores, enabling quick resets, and using console command for other mods, among other things.
+
+## Installation
+
+1. Install the MIUU Mod Loader.
+2. Download the mod from the Releases page.
+3. Extract the zip into your `Mods` folder.
+4. You should be able to use the console with `~` in-game!
+
+## Adding custom console commands to a mod
+
+Adding custom commands to your own mod is pretty simple. In a class, define a method annotated with a `ConsoleCommand` annotation, which can have the following parameters (all optional):
+
+Name | Type | Description
+--- | --- | ---
+`name` | `string` | The name of the command. You can leave it out and it will use the name of the method instead.
+`description` | `string` | The description of this command, which gets printed when running the `help` command.
+`paramsDescription` | `string` | A small description of what parameters the command takes, usually inside square brackets.
+`hidden` | `bool` | Set to true to make this command not appear in the `help` command.
+
+The method has a few requirements:
+
+* It should be a `public static` method.
+* It should either return `void` or `string`.
+	* If it returns a string, that string will be printed to the console.
+* The method should take either zero or one arguments, with the one argument being of type `params string[]` containing the parameters typed by the user.
+
+If a method meets all the requirements and is annotated, it should automatically become a usable console command in-game.
+
+### Example commands
+
+A simple example command with no parameters:
+
+```c#
+[ConsoleCommand(description = "Prints a hello world message to the console")]
+public static string HelloWorld()
+{
+	return "Hello World!";
+}
+```
+
+A simple example command which takes parameters:
+
+```c#
+[ConsoleCommand(description = "Concatenates and prints two arguments together", paramsDescription = "[string1, string2]")]
+public static string ConcatStrings(params string[] args)
+{
+	if (args.Length != 2)
+		return "Must provide two arguments!";
+	return args[0] + args[1];
+}
+```
+
+## Build
+
+If you just want to use the mod, refer to the Installation section above. These instructions are if you want to compile the mod itself.
+
+1. Clone the git repository.
+2. Install the MIUU Mod Loader, so the Harmony dll is present.
+3. Edit `UserProperties.xml` to remove the `UserPropertiesNotSetUp` property and point `GameDir` to your MIUU installation directory.
+	* **Optional but recommended**: To prevent this file from showing as changed in git, run the git command `git update-index --skip-worktree UserProperties.xml`
+4. Open `ConsoleUnlocker.sln` in Visual Studio.
+5. Click Build -> Build Solution, and it will build directly into your MIUU Mods directory.