docs: added README file

README.md

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+# Caesar
+This program provides a simple relay server that can be controlled via the command line.
+## Prerequisites
+Rust toolchain installed
+## Installation
+1. Clone the repository:
+  ```bash
+  git clone https://github.com/your-username/caesar.git
+  ```
+2. Change to the project directory:
+  ```bash
+  cd caesar
+  ```
+3. Build the program:
+```bash
+cargo build --release
+```
+
+## Usage
+The program offers the following commands:
+`serve`
+Starts the relay server.
+```bash
+./target/release/caesar serve
+```
+
+You can optionally specify the listening address and port using flags:
+```bash
+./target/release/caesar serve -p 8080 -l 192.168.1.100
+```
+By default, the server listens on 0.0.0.0:1323.
+
+`send`
+Sends data through the relay server.
+```bash
+./target/release/caesar send
+```
+
+`receive`
+Receives data through the relay server.
+```bash
+./target/release/caesar receive
+```
+
+## Help
+For more information about the commands and arguments, use:
+```bash
+./target/release/caesar --help
+```
+
+## Development
+To start a test system, please follow these steps:
+Start the relay server:
+```bash
+./target/release/caesar serve
+```
+
+Open a send window in another terminal:
+```bash
+./target/release/caesar send
+```
+
+Open a receive window in another terminal:
+```bash
+./target/release/caesar receive
+```
+
+Now you can test the functionality of the relay server.