Update README-JP.md

Author: quangctkm9207

README-JP.md

@@ -3,7 +3,8 @@
 # ControllerSDK - Android版
 
 [ ![Download](https://api.bintray.com/packages/aromajoin/maven/com.aromajoin.sdk%3Aandroid/images/download.svg) ](https://bintray.com/aromajoin/maven/com.aromajoin.sdk%3Aandroid/_latestVersion)
-[![License](https://img.shields.io/badge/license-Apache%202-4EB1BA.svg?style=flat-square)](https://www.apache.org/licenses/LICENSE-2.0.html)
+[![License](https://img.shields.io/badge/license-Apache%202-4EB1BA.svg?style=flat-square)](https://www.apache.org/licenses/LICENSE-2.0.html) 
+[![Join the community on Spectrum](https://withspectrum.github.io/badge/badge.svg)](https://spectrum.chat/aromajoin-software/)
 
 
 **[Aroma Shooter](https://aromajoin.com/products/aroma-shooter)との通信に使用されるAromaShooterControllerSDKのAndroid版です。**