fix：新增例程

基础使用/e4.RflySim3D地图场景切换实验/code/PythonCMDDemo.py

@@ -0,0 +1,9 @@
+import UE4CtrlAPI as UE4CtrlAPI
+
+#Create a new MAVLink communication instance, UDP sending port (CopterSim’s receving port) is 20100
+ue = UE4CtrlAPI.UE4CtrlAPI()
+
+# sendUE4Cmd: RflySim3D API to modify scene display style
+# Format: ue.sendUE4Cmd(cmd,windowID=-1), where cmd is a command string, windowID is the received window number (assuming multiple RflySim3D windows are opened at the same time), windowID =-1 means sent to all windows
+# Augument: RflyChangeMapbyName command means to switch the map (scene), the following string is the map name, here will switch all open windows to the grass map
+ue.sendUE4Cmd('RflyChangeMapbyName Grasslands')