Add placeholder (error) image for people

Fix #42

app/src/main/java/dev/jdtech/jellyfin/BindingAdapters.kt

@@ -95,6 +95,7 @@ fun bindPersonImage(imageView: ImageView, person: BaseItemPerson) {
         .load(jellyfinApi.api.baseUrl.plus("/items/${person.id}/Images/${ImageType.PRIMARY}"))
         .transition(DrawableTransitionOptions.withCrossFade())
         .placeholder(R.color.neutral_800)
+        .error(R.drawable.person_placeholder)
         .into(imageView)
 
     imageView.contentDescription = "${person.name} poster"

app/src/main/res/drawable/person_placeholder.xml

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item>
+        <shape android:shape="rectangle">
+            <solid android:color="@color/neutral_800" />
+        </shape>
+    </item>
+    <item
+        android:top="32dp"
+        android:bottom="32dp"
+        android:start="32dp"
+        android:end="32dp"
+        android:drawable="@drawable/ic_user"
+        android:gravity="center" />
+</layer-list>