v0.3.2-SNAPSHOT: added android-specific code and implementation, including defaultNamedStorage()

src/commonMain/kotlin/net.sergeych.bintools/KVStorage.kt

@@ -218,7 +218,19 @@ class MemoryKVStorage(copyFrom: KVStorage? = null) : KVStorage {
  *    - otherwise, the folder will be created in "`~/.local_storage`" parent directory
  *      (which also will be created if needed).
  *
- *  - For the native platorms it is not yet implemented (but will be soon).
+ *  - In Android (new!) it is implemented using preferences, but initializing is needed in
+ *      main activity `onCreate`, somewhat like:
+ *  ```kotlin
+ *       override fun onCreate(savedInstanceState: Bundle?) {
+ *          super.onCreate(savedInstanceState)
+ *          // set the Context which Preferences will be used for
+ *          // defaultNamedStorage
+ *          net.sergeych.bintools.AndroidKV.init(this)
+ *     }
+ *  ```
+ *  see also `AndroidKV` and `SharedPreferencesKVStorage` for Android
+ *
+ *  - For the native platforms it is not yet implemented (but will be soon).
  *
  *  See [DataKVStorage] and [DataProvider] to implement a KVStorage on filesystems and like,
  *  and `FileDataProvider` class on JVM target.