add READMEs

libmysyslog-client/README.md

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+## Использование
+Запустите клиент с параметрами:
+```
+/usr/local/bin/log_client -m "Your message" -l <level> -d <driver> -f <format> -p <path>
+```
+Пример:
+```
+/usr/local/bin/log_client -m "Hello, World!" -l 1 -d 0 -f 0 -p "log.txt"
+
+