add Diagram

README.md

@@ -2,6 +2,19 @@
 
 simple c implementation of [Conway's game of life](https://en.wikipedia.org/wiki/Conway%27s_Game_of_Life).
 
+## overview
+
+```plantuml
+
+(*) -> "gol_setup"
+-> "print_row"
+-> "print_colmn"
+-> "gol_tick"
+-> "print_row"
+"print_colmn"->"print_row"
+"gol_tick"->(*)
+```
+
 ## usage
 
 - download /clone the src folder.
@@ -53,4 +66,4 @@ int main(int argc, char **argv)
 ```bash
 make test
 echo $? #should be 0
-```
\ No newline at end of file
+```