test: 增加 Demo22（函数重载）

.run/Demo22.run.xml

@@ -0,0 +1,10 @@
+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="Demo22" type="Application" factoryName="Application" folderName="Demo">
+    <option name="MAIN_CLASS_NAME" value="org.jcnc.snow.cli.SnowCLI" />
+    <module name="Snow" />
+    <option name="PROGRAM_PARAMETERS" value="compile run -d playground/Demo/Demo22 -o target/Demo22 --debug" />
+    <method v="2">
+      <option name="Make" enabled="true" />
+    </method>
+  </configuration>
+</component>

playground/Demo/Demo22/Main.snow

@@ -0,0 +1,46 @@
+module: Main
+    import: os
+    function: main
+        params:
+        returns: int
+        body:
+            declare x: int = 0
+
+            x = inc(x, 1)
+            println(x)
+
+            x = inc(x, 7)
+            println(x)
+
+            return 0
+        end body
+    end function
+
+    function: inc
+        params:
+            declare num: int
+        returns: int
+        body:
+            return num + 1
+        end body
+    end function
+
+    function: inc
+        params:
+            declare num: int
+            declare v: int
+        returns: int
+        body:
+            return num + v
+        end body
+    end function
+
+    function: println
+        params:
+            declare i1: int
+        returns: void
+        body:
+            os.syscall("PRINTLN",i1)
+        end body
+    end function
+end module