Initial commit with core utilities

Add core utilities for IP address handling, process information, and OS detection

- Introduce `guess_local_ip` function to determine local IP address
- Implement `list_all_ips` to list all non-loopback IP addresses
- Add `find_process_using_port` to identify processes using specific ports
- Include OS information utility with `get_os_string`
- Setup project structure with Cargo.toml, .gitignore, and documentation
- Add comprehensive tests for all utility functions
- Configure code style guidelines in AGENTS.md

Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "pmoutils"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+get_if_addrs = "0.5.3"
+os_info = "3.8"
+netstat2 = "0.11"
+sysinfo = "0.30"
+users = "0.11"
+quick-xml = "0.37"
+xmltree = "0.10"