add README.md

Author: bandit-ibayashi

README.md

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+# Overview
+This package contains StarMgsIO SDK.
+starmgsio.jar is a library for supporting application development for Star scales. Please refer to [StarMgsIO Android SDK document](https://www.star-m.jp/products/s_print/sdk/starmgsio_sdk/manual/android/en/index.html) for detail of usage. 
+
+
+# Scope
+Supported models:
+- MG-S Scale
+    - MG-S322
+    - MG-S1501
+    - MG-S8200
+    - MG-S322 USCA
+    - MG-S1501 USCA
+    - MG-S8200 USCA<br><br>
+- MG-T Scale
+    - MG-T12
+    - MG-T30
+    - MG-T60
+    - MG-T12 UDB
+    - MG-T30 UDB
+    - MG-T60 UDB
+
+Supported OS :<br>
+Android 9.0 - Android 14.0
+
+# Copyright<br>
+Copyright 2020 - 2023 Star Micronics Co., Ltd. All rights reserved.
+