feat: implement notification badge using markers from @sk22.

Thank you a lot man! This improvement is amazing

mastodon/src/main/java/org/joinmastodon/android/model/Marker.java

@@ -1,5 +1,7 @@
 package org.joinmastodon.android.model;
 
+import com.google.gson.annotations.SerializedName;
+
 import org.joinmastodon.android.api.AllFieldsAreRequired;
 
 import java.time.Instant;
@@ -18,4 +20,11 @@ public class Marker extends BaseModel{
 				", updatedAt="+updatedAt+
 				'}';
 	}
+
+	public enum Type {
+		@SerializedName("home")
+		HOME,
+		@SerializedName("notifications")
+		NOTIFICATIONS
+	}
 }

mastodon/src/main/java/org/joinmastodon/android/model/Markers.java

@@ -0,0 +1,14 @@
+package org.joinmastodon.android.model;
+
+public class Markers {
+	public Marker notifications;
+	public Marker home;
+
+	@Override
+	public String toString() {
+		return "Markers{" +
+				"notifications=" + notifications +
+				", home=" + home +
+				'}';
+	}
+}