update godot start demo to 4.x

.gitignore

@@ -26,6 +26,7 @@ hs_err_pid*
 
 
 # 忽略IntelliJ IDEA生成的项目描述文件
+.godot
 .idea
 .vscode
 *.iml

doc/demo04_signal/image/img.png.import

@@ -0,0 +1,34 @@
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+}
+
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+
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doc/demo04_signal/image/img_1.png.import

@@ -0,0 +1,34 @@
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+path="res://.godot/imported/img_1.png-26f593290acf46703a5985b0af555fd9.ctex"
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+}
+
+[deps]
+
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+dest_files=["res://.godot/imported/img_1.png-26f593290acf46703a5985b0af555fd9.ctex"]
+
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+process/size_limit=0
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doc/demo04_signal/image/img_2.png.import

@@ -0,0 +1,34 @@
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+uid="uid://if6qdn4eg0am"
+path="res://.godot/imported/img_2.png-137f21ebfaa141ad40bf146cea6969fe.ctex"
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+}
+
+[deps]
+
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