Adds import-go example (#466)

This shows how to define, export and import functions written in Go.

Fixes #464

Signed-off-by: Adrian Cole <adrian@tetrate.io>
Co-authored-by: Takeshi Yoneda <takeshi@tetrate.io>

examples/basic/README.md

@@ -1,3 +1,3 @@
 ## Basic example
 
-This example shows how to use WebAssembly and Go-defined functions with wazero.
+This example shows how to use both WebAssembly and Go-defined functions with wazero.

examples/basic/add.go

@@ -1,4 +1,4 @@
-package main
+package add
 
 import (
 	_ "embed"

examples/basic/add_test.go

@@ -1,4 +1,4 @@
-package main
+package add
 
 import (
 	"os"
@@ -6,8 +6,7 @@ import (
 
 // Example_main ensures the following will work:
 //
-//	go build add.go
-//	./add 7 9
+//	go run add.go 7 9
 func Example_main() {
 
 	// Save the old os.Args and replace with our example input.