Add example with key presses

examples/keyboard_events/Cargo.toml

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+[package]
+name = "keyboard_events"
+version = "0.1.0"
+authors = ["Jose Palazon <jose@palako.com>"]
+license = "MIT OR Apache-2.0"
+edition = "2021"
+rust-version = "1.65"
+publish = false
+
+
+[dependencies]
+eframe = { path = "../../crates/eframe" }
+tracing-subscriber = "0.3"

examples/keyboard_events/README.md

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+```sh
+cargo run -p hello_world
+```

examples/keyboard_events/src/main.rs

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+#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")] // hide console window on Windows in release
+
+use eframe::egui;
+use egui::*;
+fn main() {
+    // Log to stdout (if you run with `RUST_LOG=debug`).
+    tracing_subscriber::fmt::init();
+
+    let options = eframe::NativeOptions::default();
+    eframe::run_native(
+        "Keyboard events",
+        options,
+        Box::new(|_cc| Box::new(Content::default())),
+    );
+}
+
+struct Content {
+    text: String,
+}
+
+impl Default for Content {
+    fn default() -> Self {
+        Self {
+            text: "".to_owned(),
+        }
+    }
+}
+
+impl eframe::App for Content {
+    fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
+        egui::CentralPanel::default().show(ctx, |ui| {
+            ui.heading("Press/Hold/Release example");
+            let text_style = TextStyle::Body;
+            let row_height = ui.text_style_height(&text_style);
+            ScrollArea::vertical()
+                .auto_shrink([false; 2])
+                .stick_to_bottom(true)
+                .show_rows(ui, row_height, self.text.len(), |ui, _row_range| {
+                    //for row in row_range {
+                    for line in self.text.lines() {
+                        ui.label(line);
+                    }
+                });
+
+            if ctx.input().key_released(Key::A) {
+                self.text.push_str("\nReleased");
+            }
+            if ctx.input().key_pressed(Key::A) {
+                self.text.push_str("\npressed");
+            }
+            if ctx.input().key_down(Key::A) {
+                self.text.push_str("\nheld");
+            }
+        });
+    }
+}