introduce a consumer proguard file

Author: hannesa2

MPChartLib/build.gradle

@@ -25,16 +25,15 @@ android {
         // https://issuetracker.google.com/issues/158695880
         buildConfigField 'String', 'VERSION_NAME', "\"${getTag()}\""
 
-        consumerProguardFiles 'proguard-project.txt'
+        consumerProguardFiles 'proguard-lib.pro'
     }
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_17
         targetCompatibility JavaVersion.VERSION_17
     }
     buildTypes {
         release {
-            minifyEnabled false
-            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+            minifyEnabled true
         }
     }
     buildFeatures {

MPChartLib/proguard-project.txt renamed to MPChartLib/proguard-lib.pro

@@ -4,4 +4,4 @@
 -keep class com.github.mikephil.charting.** { *; }
 -keep public class com.github.mikephil.charting.animation.* {
     public protected *;
-}
+}