Add ChatListAdapter

app/src/main/java/chat/rocket/android/app/chatlist/ChatListAdapter.kt

+package chat.rocket.android.app.chatlist
+
+import android.content.Context
+import android.support.v7.widget.RecyclerView
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import chat.rocket.android.R
+import kotlinx.android.synthetic.main.item_chat.view.*
+
+class ChatListAdapter(private var dataSet: List<Chat>, private val context: Context) : RecyclerView.Adapter<ChatListAdapter.ViewHolder>() {
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
+        val view = LayoutInflater.from(parent.context).inflate(R.layout.item_chat, parent, false)
+        return ViewHolder(view)
+    }
+
+    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
+        val chat = dataSet[position]
+        holder.userAvatar.setImageURI(chat.userAvatarUri)
+        holder.roomName.text = chat.roomName
+        holder.lastMessage.text = chat.lastMessage
+        holder.lastMessageTimestamp.text = chat.lastMessageTimestamp
+
+        val unreadMessage = chat.unreadMessage
+        when {
+            unreadMessage in 1..99 -> {
+                holder.unreadMessage.text = unreadMessage.toString()
+                holder.unreadMessage.visibility = View.VISIBLE
+            }
+            unreadMessage > 99 -> {
+                holder.unreadMessage.text = context.getString(R.string.msg_more_than_ninety_nine_unread_messages)
+                holder.unreadMessage.visibility = View.VISIBLE
+            }
+            else -> holder.unreadMessage.visibility = View.GONE
+        }
+    }
+
+    override fun getItemCount(): Int = dataSet.size
+
+    class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
+        val userAvatar = itemView.image_user_avatar
+        val roomName = itemView.text_room_name
+        val lastMessage = itemView.text_last_message
+        val lastMessageTimestamp = itemView.text_last_message_timestamp
+        val unreadMessage = itemView.text_unread_message
+    }
+}
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