Working on js generator, adding initializers

multiplatform-crypto-libsodium-bindings/src/commonMain/kotlin/com.ionspin.kotlin.crypto/Initializer.kt

@@ -0,0 +1,12 @@
+package com.ionspin.kotlin.crypto
+
+/**
+ * Created by Ugljesa Jovanovic (jovanovic.ugljesa@gmail.com) on 02/Aug/2020
+ */
+expect object Initializer {
+    fun isInitialized() : Boolean
+
+    suspend fun initialize()
+
+    fun initializeWithCallback(done: () -> (Unit))
+}