fix(flutter): add android extra step installing DataStore lib

cspell.json

@@ -738,6 +738,7 @@
     "javax",
     "jcenter",
     "jdoe",
+    "jetbrains",
     "jobTitle",
     "jpg",
     "js",

src/fragments/lib/datastore/flutter/getting-started/20_installLib.mdx

@@ -13,3 +13,28 @@ dependencies:
   amplify_flutter: ^0.6.0
   amplify_datastore: ^0.6.0
 ```
+
+### Update The Android Project
+
+Open `build.gradle` located under `android/app`, and enable `coreLibraryDesugaringEnabled` in `compileOptions` to support the Java8 feature used in the DataStore plugin.
+
+```groovy
+compileOptions {
+    // add this line to support Java8 features
+    coreLibraryDesugaringEnabled true
+
+    sourceCompatibility JavaVersion.VERSION_1_8
+    targetCompatibility JavaVersion.VERSION_1_8
+}
+```
+
+Add the following dependency in `dependencies`.
+
+```groovy
+dependencies {
+    // add this line to support Java8 features
+    coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:1.1.5'
+
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+}
+```