update readme

README.md

@@ -37,4 +37,62 @@ todo
 - Generate Hash with Common DIGEST Algorithm ✔️
 
 #### Example
-todo
+C
+```c
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "crypsi.h"
+
+int main(int argc, char** argv) {
+    printf("hello\n");
+
+    char* message = "wuriyanto";
+
+    unsigned char* dst_digest;
+    int dst_digets_len;
+
+    if(crypsi_sha512(message, strlen(message), &dst_digest, &dst_digets_len) != 0) {
+        printf("digest error\n");
+        return -1;
+    }
+
+    printf("message len: %d\n", dst_digets_len);
+
+    printf("digest result: %s\n", dst_digest);
+
+    free((void*) dst_digest);
+
+    return 0;
+}
+```
+
+C++
+```CPP
+#include <iostream>
+#include "crypsi.h"
+
+int main(int argc, char** argv)
+{
+
+    const char* message = "wuriyanto";
+
+    unsigned char* dst_digest;
+    unsigned int dst_digets_len;
+
+    if(crypsi_sha512((const unsigned char*) message, strlen(message), &dst_digest, &dst_digets_len) != 0) {
+        printf("digest error\n");
+        return -1;
+    }
+
+    printf("message len: %d\n", dst_digets_len);
+
+    printf("digest result: %s\n", dst_digest);
+
+    printf("__cplusplus: %ld\n", __cplusplus);
+
+    delete dst_digest;
+
+    return 0;
+}
+```