Add Java path configuration and input handling

- Introduced a new input field for Java path in the launcher UI.
- Updated the main process to handle saving and loading of the Java path.
- Enhanced game launch functionality to accept a Java path parameter.
- Added Java detection logic to find the Java executable on the system.
- Created a .gitignore file to exclude build artifacts and dependencies.

preload.js

@@ -1,12 +1,14 @@
 const { contextBridge, ipcRenderer } = require('electron');
 
-contextBridge.exposeInMainWorld('electronAPI', {
-  launchGame: (playerName) => ipcRenderer.invoke('launch-game', playerName),
-  closeWindow: () => ipcRenderer.invoke('window-close'),
-  minimizeWindow: () => ipcRenderer.invoke('window-minimize'),
-  saveUsername: (username) => ipcRenderer.invoke('save-username', username),
-  loadUsername: () => ipcRenderer.invoke('load-username'),
-  onProgressUpdate: (callback) => {
-    ipcRenderer.on('progress-update', (event, data) => callback(data));
-  }
-});
+contextBridge.exposeInMainWorld('electronAPI', {
+  launchGame: (playerName, javaPath) => ipcRenderer.invoke('launch-game', playerName, javaPath),
+  closeWindow: () => ipcRenderer.invoke('window-close'),
+  minimizeWindow: () => ipcRenderer.invoke('window-minimize'),
+  saveUsername: (username) => ipcRenderer.invoke('save-username', username),
+  loadUsername: () => ipcRenderer.invoke('load-username'),
+  saveJavaPath: (javaPath) => ipcRenderer.invoke('save-java-path', javaPath),
+  loadJavaPath: () => ipcRenderer.invoke('load-java-path'),
+  onProgressUpdate: (callback) => {
+    ipcRenderer.on('progress-update', (event, data) => callback(data));
+  }
+});