add README and LICENSE

LICENSE

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+MIT License
+
+Copyright (c) 2023-2025 Henrik Hautakoski
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# Pinger
+
+**Pinger** is a lightweight, high-performance network utility written in Go. 
+It enables users to send ICMP echo requests (pings) to specified hosts, facilitating network diagnostics and monitoring.
+
+## Features
+
+* Send ICMP echo requests to specified hosts.
+* Measure round-trip time (RTT) for each ping.
+* Support for both IPv4 and IPv6 addresses.
+* Configurable number of ping attempts and intervals.
+* Lightweight and efficient, suitable for scripting and automation.
+
+## Installation
+
+### Prerequisites
+
+* Go (version 1.20 or later) installed on your system.
+* make
+
+### Steps
+
+1. Clone the repository:
+
+```bash
+git clone https://github.com/pnx/pinger.git
+cd pinger
+```
+
+2. Build the application:
+
+```bash
+make
+```
+
+## Usage
+
+See `./pinger -h`
+
+### Example
+
+```bash
+./pinger --udp -t 30s example.com
+```
+
+This command sends UDP echo requests to example.com, stopping after 30 seconds
+
+```bash
+./pinger -c 8 -i 1s example.com
+```
+
+This command sends 8 ICMP echo requests to example.com, with a 1-second interval between pings.
+NOTE: this requires root privileges
+
+## License
+
+This project is licensed under the MIT License. See the [LICENSE](LICENSE) file for details.