chore: add GDScript sample file (#2185)

samples/gdscript.gd

@@ -0,0 +1,83 @@
+# Everything after "#" is a comment.
+# A file is a class!
+
+# (optional) icon to show in the editor dialogs:
+@icon("res://path/to/optional/icon.svg")
+
+# (optional) class definition:
+class_name MyClass
+
+# Inheritance:
+extends BaseClass
+
+
+# Member variables.
+var a = 5
+var s = "Hello"
+var arr = [1, 2, 3]
+var dict = {"key": "value", 2: 3}
+var other_dict = {key = "value", other_key = 2}
+var typed_var: int
+var inferred_type := "String"
+
+# Constants.
+const ANSWER = 42
+const THE_NAME = "Charly"
+
+# Enums.
+enum {UNIT_NEUTRAL, UNIT_ENEMY, UNIT_ALLY}
+enum Named {THING_1, THING_2, ANOTHER_THING = -1}
+
+# Built-in vector types.
+var v2 = Vector2(1, 2)
+var v3 = Vector3(1, 2, 3)
+
+
+# Functions.
+func some_function(param1, param2, param3):
+	const local_const = 5
+
+	if param1 < local_const:
+		print(param1)
+	elif param2 > 5:
+		print(param2)
+	else:
+		print("Fail!")
+
+	for i in range(20):
+		print(i)
+
+	while param2 != 0:
+		param2 -= 1
+
+	match param3:
+		3:
+			print("param3 is 3!")
+		_:
+			print("param3 is not 3!")
+
+	var local_var = param1 + 3
+	return local_var
+
+
+# Functions override functions with the same name on the base/super class.
+# If you still want to call them, use "super":
+func something(p1, p2):
+	super(p1, p2)
+
+
+# It's also possible to call another function in the super class:
+func other_something(p1, p2):
+	super.something(p1, p2)
+
+
+# Inner class
+class Something:
+	var a = 10
+
+
+# Constructor
+func _init():
+	print("Constructed!")
+	var lv = Something.new()
+	print(lv.a)