Extract info from pk script example

Code example where we extract information from a public key script. Use
go run [filename].go to run every go example instead of go build.

code/extract-from-pk-script.go

@@ -0,0 +1,45 @@
+package main
+
+import (
+	"encoding/hex"
+	"fmt"
+	"os"
+
+	"github.com/conformal/btcnet"
+	"github.com/conformal/btcscript"
+)
+
+// go run extract-from-pk-script.go
+
+// This example demonstrates extracting information from a standard public key
+// script.
+
+func main() {
+	scriptHex := "76a914128004ff2fcaf13b2b91eb654b1dc2b674f7ec6188ac"
+
+	ExtractPkScriptAddrs(scriptHex)
+	// Output:
+	// Script Class: pubkeyhash
+	// Addresses: [12gpXQVcCL2qhTNQgyLVdCFG2Qs2px98nV]
+	// Required Signatures: 1
+}
+
+func ExtractPkScriptAddrs(scriptHex string) {
+	script, err := hex.DecodeString(scriptHex)
+	handle(err)
+
+	// Extract and print details from the script.
+	scriptClass, addresses, reqSigs, err := btcscript.ExtractPkScriptAddrs(script, &btcnet.MainNetParams)
+	handle(err)
+
+	fmt.Println("Script Class:", scriptClass)
+	fmt.Println("Addresses:", addresses)
+	fmt.Println("Required Signatures:", reqSigs)
+}
+
+func handle(err error) {
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+}