extract reading of public key data from ContentProvider

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/model/KeyRingPublic.java

@@ -0,0 +1,12 @@
+package org.sufficientlysecure.keychain.model;
+
+
+import com.google.auto.value.AutoValue;
+import org.sufficientlysecure.keychain.KeyRingsPublicModel;
+
+@AutoValue
+public abstract class KeyRingPublic implements KeyRingsPublicModel {
+    public static final Factory<KeyRingPublic> FACTORY = new Factory<>(AutoValue_KeyRingPublic::new);
+
+    public static final Mapper<KeyRingPublic> MAPPER = new Mapper<>(FACTORY);
+}