Add info and sample for SVG icons and prefs edit dialog

samples/prefs-widget3.lua

@@ -0,0 +1,31 @@
+--[[
+This example shows how to use the prefs module
+to display a settings dialog automatically generated on the screen.
+]]
+
+prefs = require("prefs")
+
+function on_load()
+    -- Initialize settings with default values
+    prefs.text_field_1 = "Test"
+    prefs.text_field_2 = "Test #2"
+    prefs.numeric_field = 123
+    prefs.boolean_field = false
+    prefs._hidden_field = "Hidden"
+end
+
+function on_resume()
+    ui:show_toast("On resume called")
+    ui:show_text("Click to edit preferencies")
+end
+
+function on_click()
+    --[[
+    The `show_dialog()` method automatically creates a window of current settings from fields defined in prefs.
+    The window will display all fields with a text key and a value of one of three types: string, number, or boolean.
+    All other fields of different types will be omittedi.
+    Fields whose names start with an underscore will also be omitted.
+    Script will be reloaded on settings save.
+    ]]
+    prefs:show_dialog()
+end