initial fluent-widgets ui

docs/source/icon.md

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+## Icon
+Many widgets need icons, if you want PyQt-Fluent-Widgets change your icons automatically when the theme changes, then you can inherit `FluentIconBase` and overide `path()` method. Here is an example:
+
+```python
+from enum import Enum
+
+from qfluentwidgets import getIconColor, Theme, FluentIconBase
+
+
+class MyFluentIcon(FluentIconBase, Enum):
+    """ Custom icons """
+
+    ADD = "Add"
+    CUT = "Cut"
+    COPY = "Copy"
+
+    def path(self, theme=Theme.AUTO):
+        return f':/icons/{self.value}_{getIconColor(theme)}.svg'
+```