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Feat: add syscall example file

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	`1`	`+/**`
	`2`	`+ * Demo to show the write() system call`
	`3`	`+ * build: gcc syscall_ex.c -o syscall_ex`
	`4`	`+ * run: ./syscall_ex`
	`5`	`+ *`
	`6`	`+ */`
	`7`	`+#include <unistd.h> // for POSIX operation system API`
	`8`	`+#include <stdio.h>`
	`9`	`+#include <string.h>`
	`10`	`+#define BUFFER_SIZE 100`
	`11`	`+`
	`12`	`+int main()`
	`13`	`+{`
	`14`	`+ ssize_t len; // to store the number of byte written from write() syscall`
	`15`	`+ size_t msg_len;`
	`16`	`+ char msg[] = "Hello, World! This message is written from write() system call\n";`
	`17`	`+ char buff[BUFFER_SIZE];`
	`18`	`+`
	`19`	`+ // copy the message to the buffer`
	`20`	`+ strncpy(buff, msg, sizeof(msg));`
	`21`	`+ msg_len = strlen(buff);`
	`22`	`+`
	`23`	`+ int fd = 1; // define file descriptor. 1 = standard output`
	`24`	`+ len = write(fd, buff, msg_len);`
	`25`	`+`
	`26`	`+ return 0;`
	`27`	`+}`

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