Update README with distribution instructions

README.md

@@ -10,4 +10,11 @@ Equation were used for plotting and expression-parsing respectively.
    Simply execute `main.py` using Python. Use `-W ignore` to hide warning in the console e. g. Division by Zero.
    ```
    > python -W ignore main.py
-   ```
+   ```
+ - To build distribution, use `pyinstaller`.
+   ```
+   > pyinstaller main.py -w -i icon.ico --clean --noconfirm
+   ```
+   Note: Due to dependency issues, you might need to manually copy `matplotlib` and
+   `Equation` from your Python installation, and `icon.ico` from the source directory 
+   to the distribution folder for the executable to function properly.