[Doc] NNTrainer Tool Utilization Guide

This PR adds a guide for executing unit tests on the Android device.

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Signed-off-by: Donghyeon Jeong <dhyeon.jeong@samsung.com>

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+# Tools
+
+This section explains how to utilize the NNTrainer tools.
+
+## Running Unit Tests on Android Devices
+
+Here we will guide you through running unit tests on an Android device.
+
+#### Preparing for Android Testing
+
+Prerequisite: Install and configure the NDK
+
+```
+$ ./tools/android_test.sh
+```
+
+#### Generating Layer Golden Data
+
+```
+$ meson build [flags...]
+$ cd build
+$ adb push res/ /data/local/tmp/nntr_android_test
+```
+
+Please note that golden data is necessary to execute layer-related tests.
+
+#### Executing Unit Tests on the Android Device
+
+```
+$ adb shell
+$ cd /data/local/tmp/nntr_android_test/
+$ export LD_LIBRARY_PATH=.
+$ ./unittest_nntrainer_tensor
+```