Add readme

README.md

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+# DirectoryScanService
+
+This repository contains two submodule projects that work together to transfer files over a simple TCP-based protocol.
+
+## Clone With Submodules
+
+Use `--recurse-submodules` when cloning so both projects are checked out automatically:
+
+```bash
+git clone --recurse-submodules https://git.timoniemann.de/t/DirectoryScanService.git
+```
+
+If you already cloned the repository without submodules:
+
+```bash
+git submodule update --init --recursive
+```
+
+## Projects
+
+- [`DirectoryScanSender`](./DirectoryScanSender)  
+  Scans a directory recursively and sends eligible files to a TCP server.  
+  README: [`DirectoryScanSender/README.md`](./DirectoryScanSender/README.md)
+
+- [`DirectoryScanReceiver`](./DirectoryScanReceiver)  
+  Runs a TCP server that receives file data and writes it into an output directory.  
+  README: [`DirectoryScanReceiver/README.md`](./DirectoryScanReceiver/README.md)
+
+## How They Fit Together
+
+- `DirectoryScanSender` is the client that sends files.
+- `DirectoryScanReceiver` is the server that accepts and stores them.
+- Both use the same simple delimiter-based message format and default TCP port (`7156`).