feat: added stuff to fc-cli.c

fc-cli.c

@@ -1,5 +1,14 @@
+/*
+ * fc-cli - a command-line finance control program
+ * author: Vitor Gonçalves <vitorg at_symbol vern dot cc>
+ * license: GPLv3
+ * year: 2023
+ *
+ */
+
 #include <stdio.h>
 
-int main() {
+int main(int argc, char *argv[]) {
+    printf("fc-cli rocks!\n");
     return 0;
 }