test: 增加 Demo 24

playground/Demo/Demo24/Main.snow

@@ -0,0 +1,23 @@
+module: Main
+    import: ModuleA,os
+    function: main
+        returns: void
+        body:
+            declare a: int = ModuleA.sum(1,2)
+        end body
+    end function
+end module
+
+module: ModuleA
+    globals:
+        declare a: int = 10
+    function: sum
+        params:
+            declare a: int
+            declare b: int
+        returns: int
+        body:
+            return a + b
+        end body
+    end function
+end module