Implement on-the-fly MD5 checksum calculation

src/create.c

@@ -310,6 +310,12 @@ void *aaruf_create(const char *filepath, const uint32_t media_type, const uint32
     ctx->rewinded           = false;
     ctx->last_written_block = 0;
 
+    if(parsed_options.md5)
+    {
+        ctx->calculating_md5 = true;
+        aaruf_md5_init(&ctx->md5_context);
+    }
+
     // Is writing
     ctx->isWriting = true;