Added a readme

README.md

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+KeePassTrayIconLockState
+===
+
+Replace the KeePass tray icon with a white wireframe style to match Windows 10, with an hourglass shown while the password is being decrypted. When the database is locked or closed, the icon will be hidden.
+
+## Requirements
+- [KeePass 2](https://keepass.info/download.html) for Windows
+- [.NET Framework 4.8 runtime](https://dotnet.microsoft.com/download/dotnet-framework/net48)
+
+## Installation
+1. Download `KeePassTrayIconLockState.dll` from the [latest release](https://github.com/Aldaviva/KeePassTrayIconLockState/releases/latest).
+1. Save `KeePassTrayIconLockState.dll` to the `Plugins` directory inside your KeePass installation directory, *e.g.*
+    ```text
+    C:\Program Files\KeePass Password Safe 2\Plugins\KeePassTrayIconLockState\KeePassTrayIconLockState.dll
+    ```
+1. Restart KeePass.
+
+## Behavior
+<dl>
+<dt>Database is open</dt>
+<dd>The tray icon is a white wireframe padlock icon that matches the visual style of Windows 10's built-in tray icons.</dd>
+<dt>Database is being loaded and decrypted</dt>
+<dd>A small hourglass is added to the padlock tray icon until the database is finished opening.</dd>
+<dt>Database is locked or closed</dt>
+<dd>Tray icon is removed. To interact with KeePass in this state, launch the program again or use a system-wide KeePass hotkey to open its window or perform auto-type (set in Tools → Options → Integrations).</dd>
+</dl>