add golang bind example

examples/README.md

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+ctss bind examples
+==================
+
+### Build golang
+
+```
+go build -ldflags="-r lib" keygen.go
+```

examples/golang/.gitignore

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+/keygen
+/local-share*.json

examples/golang/keygen.go

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+package main
+
+/*
+#cgo LDFLAGS: -L./lib -lctss
+#include "./lib/ctss.h"
+*/
+import "C"
+import (
+	"fmt"
+	"log"
+	"os"
+	"strconv"
+)
+
+func main() {
+	fmt.Println("input index:")
+	var indexStr string
+	_, err := fmt.Scanln(&indexStr)
+	if err != nil {
+		log.Fatalln(err)
+	}
+
+	index, err := strconv.Atoi(indexStr)
+	if err != nil {
+		log.Fatalln(err)
+	}
+	data := C.keygen(C.CString("http://localhost:8000/"), C.CString("default-keygen"), C.uint16_t(index), 1, 3)
+
+	file, err := os.Create(fmt.Sprintf("local-share%d.json", index))
+	if err != nil {
+		log.Fatalln(err)
+	}
+	defer file.Close()
+
+	_, err = file.WriteString(C.GoString(data))
+	if err != nil {
+		log.Fatalln(err)
+	}
+}

examples/golang/lib/ctss.h

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+#include <stdint.h>
+
+const char *keygen(const char *server_url,
+                   const char *room,
+                   uint16_t index,
+                   uint16_t threshold,
+                   uint16_t number_of_parties);