add functions

simple/caller/main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"fmt"
 	"log"
 
 	wasmgo "github.com/vedhavyas/wasm"
@@ -12,7 +13,11 @@ func main() {
 		log.Fatal(err)
 	}
 
-	if err := b.Run(); err != nil {
-		log.Fatal(err)
-	}
+	init, done := make(chan bool), make(chan error)
+	go b.Run(init, done)
+	<-init
+	res, err := b.CallFunc("printWasm", &[]interface{}{"success call"})
+	fmt.Println(res, err)
+	err = <-done
+	fmt.Println("wasm exited", err)
 }