added xmake benchmark target

xmake.lua

@@ -11,18 +11,27 @@ target("core")
     add_files("src/Pieces/*.cpp")
     add_files("src/Core/*.cpp")
 
-target("text")
-    set_kind("binary")
-    set_default(false)
-    add_files("./src/TextUI/*.cpp")
-    add_deps("core")
-    
 target("graph")
+    set_default(true)
     set_kind("binary")
     add_files("./src/GraphicalUI/**.cpp")
     add_deps("core")
     add_packages("sfml")
 
+target("text")
+    set_default(false)
+    set_kind("binary")
+    add_files("./src/TextUI/*.cpp")
+    add_deps("core")
+
+target("benchmark")
+    set_default(false)
+    set_kind("binary")
+    add_files("./src/TextUI/*.cpp")
+    add_deps("core")
+    add_defines("BENCHMARK")
+
+
 --
 -- If you want to known more usage about xmake, please see https://xmake.io
 --