Update README.md

Author: JaroMasta

README.md

@@ -27,6 +27,8 @@ GreekBase
 ├── inputs/                           ← example source files
 ├── output/                           ← generated C source files
 ├── run.sh                            ← bash script for generating ANTLR files
+├── run.bat                           ← bat (Windows) script for generating ANTLR files
+├── gui.py                            ← Graphic interface for compiler
 └── main.py                           ← main file that starts the compiler
 ```
 ## Details
@@ -99,4 +101,4 @@ printf("%d", x);
 printf("%d", y);
 return 0;
 }
-```
+```