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ce5bd74ed552

Add function example to first_steps example

It'll be used in documentation to show how to create function in
Beremiz.

/* Beremiz' header file for use by extensions */

#include "iec_types.h"

#define LOG_LEVELS 4

#define LOG_CRITICAL 0

#define LOG_WARNING 1

#define LOG_INFO 2

#define LOG_DEBUG 3

extern unsigned long long common_ticktime__;

int LogMessage(uint8_t level, char* buf, uint32_t size);

long AtomicCompareExchange(long* atomicvar,long compared, long exchange);