Add loading vector drawable and its animation resources

app/src/main/res/anim/rotation.xml

+<?xml version="1.0" encoding="utf-8"?>
+<set xmlns:android="http://schemas.android.com/apk/res/android">
+    <objectAnimator
+        android:duration="1000"
+        android:propertyName="rotation"
+        android:repeatCount="-1"
+        android:valueFrom="0"
+        android:valueTo="360" />
+</set>
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app/src/main/res/drawable/ic_loading.xml

+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="16dp"
+    android:height="16dp"
+    android:viewportHeight="100.0"
+    android:viewportWidth="100.0">
+    <group
+        android:name="rotationGroup"
+        android:pivotX="50"
+        android:pivotY="50"
+        android:rotation="90">
+        <path
+            android:fillColor="#00000000"
+            android:pathData="M85,50A35,35 108.96,1 0,74.79 74.79"
+            android:strokeColor="#FFFFFF"
+            android:strokeWidth="12" />
+        <path
+            android:fillColor="#FFFFFF"
+            android:pathData="M105,49L70,49L85,65L100,49" />
+    </group>
+</vector>

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

+<?xml version="1.0" encoding="utf-8"?>
+<animated-vector xmlns:tools="http://schemas.android.com/tools"
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    tools:targetApi="lollipop" android:drawable="@drawable/ic_loading">
+
+    <target
+        android:name="rotationGroup"
+        android:animation="@anim/rotation" />
+
+</animated-vector>
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