Update instrumentation test docs

CI won't test this due to OOM. Now we rely on local instrumentation test.

Author: kirklandsign

examples/demo-apps/android/LlamaDemo/run_instrumentation_test.sh

@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the BSD-style license found in the
+# LICENSE file in the root directory of this source tree.
+
+set -eu
+
+BASEDIR=$(dirname "$0")
+pushd "$BASEDIR"/../../../../
+curl -C - -Ls "https://huggingface.co/karpathy/tinyllamas/resolve/main/stories110M.pt" --output stories110M.pt
+curl -C - -Ls "https://raw.githubusercontent.com/karpathy/llama2.c/master/tokenizer.model" --output tokenizer.model
+# Create params.json file
+touch params.json
+echo '{"dim": 768, "multiple_of": 32, "n_heads": 12, "n_layers": 12, "norm_eps": 1e-05, "vocab_size": 32000}' > params.json
+python -m examples.models.llama.export_llama -c stories110M.pt -p params.json -d fp16 -n stories110m_h.pte -kv
+python -m pytorch_tokenizers.tools.llama2c.convert -t tokenizer.model -o tokenizer.bin
+
+adb mkdir -p /data/local/tmp/llama
+adb push stories110m_h.pte /data/local/tmp/llama
+adb push tokenizer.bin /data/local/tmp/llama
+popd
+
+pushd "$BASEDIR"
+./gradlew connectedAndroidTest
+popd
+