Add new examples

example/examples/basic/radio_group/radio_group.lua

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+local component = require("druid.component")
+local event = require("druid.event")
+
+-- Require checkbox component from checkbox example
+local checkbox = require("example.examples.basic.checkbox.checkbox")
+
+---@class radio_group: druid.base_component
+---@field druid druid_instance
+---@field button druid.button
+local M = component.create("radio_group")
+
+
+---@param template string
+---@param nodes table<hash, node>
+function M:init(template, nodes)
+	self.druid = self:get_druid(template, nodes)
+
+	self.state = {}
+	self.checkboxes = {
+		self.druid:new(checkbox, "checkbox_1"),
+		self.druid:new(checkbox, "checkbox_2"),
+		self.druid:new(checkbox, "checkbox_3")
+	}
+
+	for i = 1, #self.checkboxes do
+ 		self.checkboxes[i].on_state_changed:subscribe(self.on_checkbox_click, self)
+		self.state[i] = false
+	end
+
+	self.checkboxes[1]:set_state(true)
+	self.state[1] = true
+
+	self.on_state_changed = event.create()
+end
+
+
+function M:on_checkbox_click()
+	local new_clicked = nil
+	for index = 1, #self.checkboxes do
+		if self.checkboxes[index]:get_state() ~= self.state[index] then
+			new_clicked = index
+			break
+		end
+	end
+
+	for index = 1, #self.state do
+		self.checkboxes[index]:set_state(index == new_clicked)
+		self.state[index] = index == new_clicked
+	end
+
+	self.on_state_changed:trigger(new_clicked)
+end
+
+
+return M