add show version to command line args

src/main/java/com/sparrowwallet/sparrow/Args.java

@@ -20,6 +20,9 @@ public class Args {
     @Parameter(names = { "--terminal", "-t" }, description = "Terminal mode", arity = 0)
     public boolean terminal;
 
+    @Parameter(names = { "--version", "-v" }, description = "Show version", arity = 0)
+    public boolean version;
+
     @Parameter(names = { "--help", "-h" }, description = "Show usage", help = true)
     public boolean help;
 

src/main/java/com/sparrowwallet/sparrow/SparrowWallet.java

@@ -34,6 +34,11 @@ public class SparrowWallet {
             System.exit(0);
         }
 
+        if(args.version) {
+            System.out.println("Sparrow Wallet " + APP_VERSION);
+            System.exit(0);
+        }
+
         if(args.level != null) {
             Drongo.setRootLogLevel(args.level);
         }