feat(local-windows-rdp): add README for Windows RDP Desktop module with usage examples and requirements

Author: DevelopmentCats

registry/coder/modules/local-windows-rdp/README.md

@@ -0,0 +1,75 @@
+---
+display_name: Windows RDP Desktop
+description: Add a one-click RDP Desktop button using Coder Desktop URI functionality
+icon: ../../../../.icons/desktop.svg
+maintainer_github: coder
+verified: true
+tags: [rdp, windows, desktop]
+---
+
+# Windows RDP Desktop
+
+This module adds a one-click button to launch Remote Desktop Protocol (RDP) sessions directly through Coder Desktop using URI handling. This provides seamless RDP access without requiring manual port forwarding.
+
+```tf
+module "rdp_desktop" {
+  count    = data.coder_workspace.me.start_count
+  source   = "registry.coder.com/coder/local-windows-rdp/coder"
+  version  = "1.0.0"
+  agent_id = coder_agent.main.id
+}
+```
+
+## Requirements
+
+- **Coder Desktop**: This module requires [Coder Desktop](https://github.com/coder/coder/releases) to be installed on the client machine
+- **Windows Workspace**: The target workspace must be running Windows with RDP enabled
+- **Agent**: A Coder agent must be running on the Windows workspace
+
+## Features
+
+- ✅ One-click RDP access through Coder Desktop
+- ✅ No manual port forwarding required
+- ✅ Configurable authentication credentials
+- ✅ Customizable display name and ordering
+- ✅ Secure credential handling
+
+## Examples
+
+### Basic Usage
+
+```tf
+module "rdp_desktop" {
+  count    = data.coder_workspace.me.start_count
+  source   = "registry.coder.com/coder/local-windows-rdp/coder"
+  version  = "1.0.0"
+  agent_id = coder_agent.main.id
+}
+```
+
+### Custom Credentials
+
+```tf
+module "rdp_desktop" {
+  count    = data.coder_workspace.me.start_count
+  source   = "registry.coder.com/coder/local-windows-rdp/coder"
+  version  = "1.0.0"
+  agent_id = coder_agent.main.id
+  username = "MyUser"
+  password = "MySecurePassword123!"
+}
+```
+
+### Custom Display and Agent
+
+```tf
+module "rdp_desktop" {
+  count        = data.coder_workspace.me.start_count
+  source       = "registry.coder.com/coder/local-windows-rdp/coder"
+  version      = "1.0.0"
+  agent_id     = coder_agent.windows.id
+  agent_name   = "windows"
+  display_name = "Windows Desktop"
+  order        = 1
+}
+```