add docs to mapper serialization and allow to use them as supertypes

serialization/mapper/src/commonMain/kotlin/MapperDeserializationStrategy.kt

@@ -0,0 +1,26 @@
+package dev.inmo.micro_utils.serialization.mapper
+
+import kotlinx.serialization.DeserializationStrategy
+import kotlinx.serialization.KSerializer
+import kotlinx.serialization.SerializationStrategy
+import kotlinx.serialization.descriptors.SerialDescriptor
+import kotlinx.serialization.encoding.Decoder
+import kotlinx.serialization.encoding.Encoder
+
+/**
+ * Use this serializer when you have deserializable type [I] and want to map it to some [O] in process of
+ * deserialization
+ *
+ * @param base Serializer for [I]
+ * @param deserialize Will be used in [deserialize] method to convert deserialized by [base] [I] to [O]
+ */
+open class MapperDeserializationStrategy<I, O>(
+    private val base: DeserializationStrategy<I>,
+    private val deserialize: (I) -> O
+) : DeserializationStrategy<O> {
+    override val descriptor: SerialDescriptor = base.descriptor
+
+    override fun deserialize(decoder: Decoder): O {
+        return deserialize(base.deserialize(decoder))
+    }
+}