Create SETUP.md

.github/SETUP.md

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+## Building the application.
+Install Node.js 20 on your machine and go to the project root and run following command:
+```
+npm run install
+```
+In order to generate the executables run following command: 
+```
+npm run package
+```
+To generate executables for all platforms run this:
+```
+npm run package-all
+```
+
+Note: Executables can be found in `release/build` folder.
+
+## Customizing the application
+- Localization is located on `src/renderer/i18n` folder.
+- App configuration can be found on `src/renderer/config` folder