Add basic main.c with console setup

Create minimal Switch homebrew application.
- Initialize console and input handling
- Basic event loop with exit on Plus button
- Foundation for BOTW save tool

source/main.c

@@ -0,0 +1,31 @@
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <switch.h>
+
+int main(int argc, char **argv)
+{
+    consoleInit(NULL);
+    
+    // Configure input
+    padConfigureInput(1, HidNpadStyleSet_NpadStandard);
+    PadState pad;
+    padInitializeDefault(&pad);
+    
+    printf("BOTW Save Tool v0.1\n");
+    printf("Press + to exit\n");
+    
+    // Main loop
+    while(appletMainLoop())
+    {
+        padUpdate(&pad);
+        u64 kDown = padGetButtonsDown(&pad);
+        
+        if (kDown & HidNpadButton_Plus) break;
+        
+        consoleUpdate(NULL);
+    }
+    
+    consoleExit(NULL);
+    return 0;
+}