input docs an exampels

docs/guide/input.md

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+# Input
+
+This chapter will discuss how to make your app respond to input in the form of key presses and mouse actions.
+
+!!! quote
+
+    More Input!
+
+    — Johnny Five
+
+## Key events
+
+The most fundamental way to receive input in via [Key](./events/key) events. Let's take a closer look at key events with an app that will display key events as you type.
+
+=== "key01.py"
+
+    ```python title="key01.py" hl_lines="12-13"
+    --8<-- "docs/examples/guide/input/key01.py"
+    ```
+
+=== "Output"
+
+    ```{.textual path="docs/examples/guide/input/key01.py", press="T,e,x,t,u,a,l,!,_"}
+    ```
+
+Note the key event handler which