docs: update readme (#10)

* docs: update readme

* fix indentation

Author: shrimalmadhur

README.md

@@ -39,6 +39,8 @@ import (
 	"google.golang.org/grpc/credentials/insecure"
 )
 
+const SIGNER_API_KEY = "<API-KEY>"
+
 func main() {
 	conn, err := grpc.NewClient(
 		"localhost:50051", 
@@ -55,10 +57,13 @@ func main() {
     defer cancel()
 
     req := &v1.SignGenericRequest{
-		PublicKey: "0xabcd",
-		Password:  "p@$$w0rd",
-		Data:      []byte{0x01, 0x02, 0x03},
+        PublicKeyG1: "0xabcd",
+        Password:  "p@$$w0rd",
+        Data:      []byte{0x01, 0x02, 0x03},
     }
+
+    // Pass the API key to the signer client
+    ctx = metadata.AppendToOutgoingContext(ctx, "authorization", SIGNER_API_KEY)
     resp, err := c.SignGeneric(ctx, req)
     if err != nil {
         log.Fatalf("could not sign: %v", err)