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

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

@@ -0,0 +1,25 @@
+package dev.inmo.micro_utils.serialization.mapper
+
+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 serializable type [I] and want to map it to some [O] in process of
+ * serialization
+ *
+ * @param base Serializer for [I]
+ * @param serialize Will be used in [serialize] method to convert incoming [O] to [I] and serialize with [base]
+ */
+open class MapperSerializationStrategy<I, O>(
+    private val base: SerializationStrategy<I>,
+    private val serialize: (O) -> I
+) : SerializationStrategy<O> {
+    override val descriptor: SerialDescriptor = base.descriptor
+
+    override fun serialize(encoder: Encoder, value: O) {
+        base.serialize(encoder, serialize(value))
+    }
+}