Add fresco proguard rules

Summary:
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Adds proguard rules, which I missed off from the #18496 PR.

I've added the proguard rules as suggested in http://frescolib.org/docs/shipping.html, with the duplicates & unused libraries removed.

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CI passes.
Build example project with proguard turned on.

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[ANDROID] [BREAKING] [proguard] - Update Proguard config in template. If upgrading make sure you update your project's proguard file.

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    CATEGORY
  [----------]      TYPE
  [ CLI      ] [-------------]    LOCATION
  [ DOCS     ] [ BREAKING    ] [-------------]
  [ GENERAL  ] [ BUGFIX      ] [ {Component} ]
  [ INTERNAL ] [ ENHANCEMENT ] [ {Filename}  ]
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 [IOS] [BREAKING] [FlatList] - Change a thing that breaks other things
 [ANDROID] [BUGFIX] [TextInput] - Did a thing to TextInput
 [CLI] [FEATURE] [local-cli/info/info.js] - CLI easier to do things with
 [DOCS] [BUGFIX] [GettingStarted.md] - Accidentally a thing/word
 [GENERAL] [ENHANCEMENT] [Yoga] - Added new yoga thing/position
 [INTERNAL] [FEATURE] [./scripts] - Added thing to script that nobody will see
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cc foghina & hramos
Closes https://github.com/facebook/react-native/pull/18499

Differential Revision: D7366113

Pulled By: foghina

fbshipit-source-id: 20864c34976bc3930d9fdcc9428f40f7a8d7a9b8

local-cli/templates/HelloWorld/android/app/proguard-rules.pro

@@ -54,6 +54,25 @@
 # See libs/proxy/src/main/java/com/facebook/fbui/textlayoutbuilder/proxy for details.
 -dontwarn android.text.StaticLayout
 
+# Fresco
+# Keep our interfaces so they can be used by other ProGuard rules.
+# See http://sourceforge.net/p/proguard/bugs/466/
+-keep,allowobfuscation @interface com.facebook.soloader.DoNotOptimize
+
+# Do not strip any method/class that is annotated with @DoNotOptimize
+-keep @com.facebook.soloader.DoNotOptimize class *
+-keepclassmembers class * {
+    @com.facebook.soloader.DoNotOptimize *;
+}
+
+# Keep native methods
+-keepclassmembers class * {
+    native <methods>;
+}
+
+-dontwarn javax.annotation.**
+-dontwarn com.facebook.infer.**
+
 # okhttp
 
 -keepattributes Signature