model,ui 추가, layout 추가

.../java/com/cc/wee/opensource_projectapp/model/ChatModel.kt

...a/com/cc/wee/opensource_projectapp/model/OnDataChanged.kt

...a/com/cc/wee/opensource_projectapp/model/OnUploadImage.kt

.../java/com/cc/wee/opensource_projectapp/model/UserModel.kt

...java/com/cc/wee/opensource_projectapp/ui/LoginActivity.kt

app/src/main/res/layout/activity_login.xml

app/src/main/res/layout/activity_main.xml

app/src/main/res/layout/recycler_item_chat.xml