Prepare documentation

Author: g41797

README.md

@@ -2,8 +2,50 @@
 
 # Zig syslog client
 
-[![CI](https://github.com/g41797/syslog/actions/workflows/ci.yml/badge.svg)](https://github.com/g41797/syslog/actions/workflows/ci.yml)
+[![CI](https://github.com/g41797/syslog/actions/workflows/ci.yml/badge.svg)](https://github.com/g41797/syslog/actions/workflows/ci.yml)[![Wiki](https://img.shields.io/badge/Wikipedia-%23000000.svg?style=for-the-badge&logo=wikipedia&logoColor=white)](https://en.wikipedia.org/wiki/Syslog)
 
-WIP
 
+  This is a [syslog](https://en.wikipedia.org/wiki/Syslog) client library for Zig. It supports:
+- subset of [RFC5424](https://datatracker.ietf.org/doc/html/rfc5424)
+- UDP
+- TCP
+
+  
+
+  
+  
+
+## Hello, Zig!
+     
+When client code calls
+```zig
+    logger.write_info("Hello, Zig!");
+```
+
+[syslog client](src/syslog.zig) sends following text message to syslog receiver process:
+>
+> <190>1 2024-10-09T09:07:11+00:00 BLKF zigprocess 18548 1 - Hello, Zig!
+> 
+   
+    
+Let's see what this message consist of:
+   
+| Value | Definition | Description                                            |
+|:-----------:|  :---:           |:-------------------------------------------------------|
+|   190     |    PRIVAL        | Priority                                               |
+|   1     |    VERSION        | Always 1                                               |
+|   2024-10-09T09:07:11+00:00     |    TIMESTAMP        | FULL-DATE "T" FULL-TIME                                |
+|   BLKF     |    HOSTNAME        | Hostname or '-'                                        |
+|   zigprocess     |    APP-NAME        | Application name provided by caller                    |
+|   18548     |    PROCID        | Process ID or  '-'                                     |
+|   1     |    MSGID        | Message ID - sequential number generated automatically |
+|   -     |    STRUCTURED-DATA        | Always '-'                                             |
+|   Hello, Zig!     |    MSG        | Message                                                |
+
+    
+
+     
+     
+       
+    
 ![](_logo/CLion_icon.png)