Add a pro guard section

This is what worked for me, not sure if you want to add more details
dooboolab-community · Dec 5, 2018 · 8ba7fd2 · 8ba7fd2
1 parent 0e74e68
commit 8ba7fd2
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diff --git a/README.md b/README.md
@@ -394,6 +394,18 @@ class _MyAppState extends State<MyApp> {
 }
 ```
 
+## ProGuard
+If you have eneabled proguard you will need to add the following rules to your `proguard-rules.pro`
+
+```
+#In app Purchase
+-keep class com.amazon.** {*;}
+-keep class com.dooboolab.** { *; }
+-keep class com.android.vending.billing.**
+-dontwarn com.amazon.**
+-keepattributes *Annotation*
+```
+
 ## Q & A
 
 #### Can I buy product right away skipping fetching products if I already know productId?