Add README with features, setup, and configuration reference

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: RestoreMonarchy

README.md

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+# Steam Account Restrictor
+Block suspicious Steam accounts from joining your Unturned server.
+
+## Features
+- Kick accounts with private Steam profiles
+- Kick limited Steam accounts (no purchases / not full members)
+- Kick accounts younger than a configurable age
+- Kick VAC banned accounts
+- Bypass permission for staff and trusted players
+- Optional custom kick command (e.g. ban via your own kick/ban plugin)
+- Fully asynchronous Steam Web API checks — zero impact on server tick
+
+## Permissions
+| Permission | Description |
+|------------|-------------|
+| `steamaccountrestrictor.bypass` | Skip all Steam account checks for this player or group |
+
+## Setup
+1. Install the plugin into the `Rockets/Plugins` directory.
+2. Get a Steam Web API key from https://steamcommunity.com/dev/apikey
+3. Open `SteamAccountRestrictor.configuration.xml` and paste your key into `SteamWebAPIKey`.
+4. Toggle the checks you want enabled and restart the server.
+
+## Configuration
+```xml
+<?xml version="1.0" encoding="utf-8"?>
+<SteamAccountRestrictorConfiguration xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
+  <Debug>false</Debug>
+  <SteamWebAPIKey>APIKEY</SteamWebAPIKey>
+  <KickPrivateProfiles>true</KickPrivateProfiles>
+  <KickLimitedAccounts>true</KickLimitedAccounts>
+  <KickMinimumAgeAccounts>true</KickMinimumAgeAccounts>
+  <MinimumAccountAgeDays>3</MinimumAccountAgeDays>
+  <KickVACBanAccounts>false</KickVACBanAccounts>
+  <UseKickCommand>false</UseKickCommand>
+  <KickCommand>kick {steamid} "{reason}"</KickCommand>
+  <KickCommandDelay>1</KickCommandDelay>
+</SteamAccountRestrictorConfiguration>
+```
+
+### Configuration Options
+| Option | Description |
+|--------|-------------|
+| `Debug` | Enable debug logging |
+| `SteamWebAPIKey` | Your Steam Web API key from https://steamcommunity.com/dev/apikey |
+| `KickPrivateProfiles` | Kick players whose Steam profile is private |
+| `KickLimitedAccounts` | Kick players with limited Steam accounts (e.g. no purchases) |
+| `KickMinimumAgeAccounts` | Kick players whose Steam account is younger than `MinimumAccountAgeDays` |
+| `MinimumAccountAgeDays` | Minimum required Steam account age in days |
+| `KickVACBanAccounts` | Kick players with any VAC ban on their Steam account |
+| `UseKickCommand` | Use a custom kick command instead of the built-in kick |
+| `KickCommand` | Command template; supports `{steamid}` and `{reason}` placeholders |
+| `KickCommandDelay` | Delay in seconds before executing the custom kick command |
+
+## Translations
+```xml
+<?xml version="1.0" encoding="utf-8"?>
+<Translations xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
+  <Translation Id="KICKED_PRIVATE_PROFILE" Value="Your Steam profile is private." />
+  <Translation Id="KICKED_LIMITED_ACCOUNT" Value="Your Steam account is limited." />
+  <Translation Id="KICKED_MINIMUM_ACCOUNT_AGE" Value="Your Steam account is too young. It must be at least {0} days old." />
+  <Translation Id="KICKED_VAC_BANNED" Value="Your Steam account is VAC banned." />
+</Translations>
+```