added versioning, requirements and setup

README.md

@@ -1,4 +1,4 @@
-# PNG Metadata Editor
+# PNG Metadata Editor v1.0.0
 
 A graphical tool for viewing and editing metadata in PNG files.
 
@@ -42,21 +42,42 @@ pip install pillow pngmeta
 
 ## Building for Distribution
 
-To create a standalone executable:
+### Mac OS (using py2app)
+
+1. First install the required build tools:
+   ```bash
+   pip install py2app
+   ```
+
+2. Build the application bundle:
+   ```bash
+   python setup.py py2app
+   ```
+
+3. The resulting .app bundle will be in the `dist/` directory
+
+### Windows (using PyInstaller)
 
 ```bash
 pyinstaller --name="PNG Metadata Editor" \
             --windowed \
             --onefile \
-            --icon=AppIcon.icns \
+            --icon=AppIcon.ico \
             png-meta-editor.py
 ```
 
-The resulting executable will be in the `dist/` directory.
+### Linux (using PyInstaller)
+
+```bash
+pyinstaller --name="PNG Metadata Editor" \
+            --windowed \
+            --onefile \
+            png-meta-editor.py
+```
 
 ## License
 
-This project is licensed under the MIT License - see the [LICENSE](LICENSE) file for details.
+This project is licensed under the MIT License - see [LICENSE](LICENSE) for details.
 
 ## Author
 
@@ -65,4 +86,4 @@ Robert Tusa
 
 ## Version History
 
-- 2026-01-05: Initial release
+- **1.0.0 (2026-01-05)**: Initial release