Initial commit: minimal relay server and CLI structure

Relay pairs connections by room name and pipes bytes between them,
with no password/PAKE handshake at the relay layer — codephrase-based
encryption is left to the client side of the transfer.

main.go

@@ -0,0 +1,29 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"os/signal"
+	"syscall"
+
+	"github.com/tzgyn/share/src/cli"
+	"github.com/tzgyn/share/src/utils"
+)
+
+func main() {
+	sigs := make(chan os.Signal, 1)
+	signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
+
+	go func() {
+		if err := cli.Run(); err != nil {
+			fmt.Println(err)
+			os.Exit(1)
+		}
+		utils.RemoveMarkedFiles()
+		os.Exit(0)
+	}()
+
+	<-sigs
+	utils.RemoveMarkedFiles()
+	os.Exit(0)
+}