Adding src/main example.

src/main.c

@@ -0,0 +1,30 @@
+#include <libgen.h>
+#include <stdio.h>
+
+#include <mgba/core/core.h>
+#include <mgba-util/vfs.h>
+
+struct controller {
+    struct mCoreThread *thread;
+    color_t *videoOutputBuffer;
+};
+
+int main() {
+    unsigned width, height;
+    char *file = "/home/sergio/ruby.gba";
+	struct mCore* core = mCoreFind(file);
+    core->init(core);
+	core->desiredVideoDimensions(core, &width, &height);
+	ssize_t bufferSize = (width * height) * BYTES_PER_PIXEL;
+    color_t* videoOutputBuffer = calloc(width * height, bufferSize);
+	core->setVideoBuffer(core, videoOutputBuffer, width);
+    mCoreLoadFile(core, file);
+    mCoreInitConfig(core, NULL);
+	mCoreConfigSetDefaultValue(&core->config, "idleOptimization", "detect");
+	mCoreLoadConfig(core);
+    core->reset(core);
+    for (int i = 0; i < 50; i++) {
+        core->runFrame(core);
+    }
+    mCoreTakeScreenshot(core);
+}