增加windows端屏幕捕获编码demo

demo/windows_sender/README.md

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+# Windows Sender Demo
+
+This is a simplified demo of the Windows Host sender for DisplayFlow.
+It demonstrates:
+1. Screen Capture using Desktop Duplication API (DXGI).
+2. Hardware H.264 Encoding using Media Foundation (MF).
+3. Network Transmission using UDP.
+
+## Prerequisites
+
+- Windows 10/11
+- Visual Studio 2019 or later (with C++ Desktop Development)
+- CMake 3.10+
+
+## Build
+
+1. Open a terminal (Developer Command Prompt for VS).
+2. Navigate to this directory:
+   ```cmd
+   cd demo\windows_sender
+   ```
+3. Create a build directory:
+   ```cmd
+   mkdir build
+   cd build
+   ```
+4. Configure and Build:
+   ```cmd
+   cmake ..
+   cmake --build . --config Release
+   ```
+
+## Run
+
+Run the executable with target IP and Port (optional):
+
+```cmd
+.\Release\WindowsSenderDemo.exe <TargetIP> <Port>
+```
+
+Example:
+```cmd
+.\Release\WindowsSenderDemo.exe 192.168.1.100 8888
+```
+
+## Implementation Details
+
+- **ScreenCapture**: Uses `IDXGIOutputDuplication` to capture desktop frames.
+- **VideoEncoder**: Uses `IMFTransform` (Media Foundation) to encode frames to H.264. 
+  - *Note*: This demo attempts to feed RGB32 textures to the encoder. If the hardware encoder only supports NV12, conversion logic is needed (not fully implemented in this minimal demo).
+- **NetworkSender**: Fragments the H.264 stream into UDP packets (MTU ~1400 bytes) and sends them to the target.
+
+## Protocol
+
+The demo uses a simple custom protocol for feasibility verification:
+- **Packet Header** (Network Layer): `FrameID` (4B), `FragID` (2B), `TotalFrags` (2B).
+- **Frame Header** (Application Layer, in first fragment/reassembled): `Timestamp` (8B), `Width` (4B), `Height` (4B), `Type` (4B), `Size` (4B).
+- **Payload**: H.264 NAL units.