adding missing file

recipes/inference/mobile_inference/android_inference/mlc-package-config.json

+{
+    "device": "android",
+    "model_list": [
+        {
+            "model": "HF://mlc-ai/Llama-3-8B-Instruct-q4f16_1-MLC",
+            "estimated_vram_bytes": 4348727787,
+            "model_id": "Llama-3-8B-Instruct",
+            "overrides": {
+                "context_window_size": 768,
+                "prefill_chunk_size": 256
+            }
+        }
+    ]
+}
\ No newline at end of file