Add the basics of Label docs for the manual

docs/widgets/label.md

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+# Label
+
+A widget which displays static text, but which can also contain more complex Rich renderables.
+
+- [ ] Focusable
+- [x] Container
+
+## Example
+
+The example below shows how you can use a `Label` widget to display some text.
+
+=== "Output"
+
+    ```{.textual path="docs/examples/widgets/label.py"}
+    ```
+
+=== "label.py"
+
+    ```python
+    --8<-- "docs/examples/widgets/label.py"
+    ```
+
+## Reactive Attributes
+
+This widget has no reactive attributes.
+
+## Messages
+
+This widget sends no messages.
+
+## See Also
+
+* [Label](../api/label.md) code reference