Add example select_file

examples/select_file/Cargo.toml

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+[package]
+name = "select_file"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+eframe = { version = "0.25.0", default-features = false, features = ["glow"] }
+egui-file-dialog = { version = "0.1.0", path = "../../"}

examples/select_file/README.md

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+Example showing how to select a file using the file dialog.
+
+```
+cargo run -p select_file
+```
+
+![](screenshot.png)

examples/select_file/src/main.rs

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+use std::path::PathBuf;
+
+use eframe::egui;
+use egui_file_dialog::FileDialog;
+
+struct MyApp {
+    file_dialog: FileDialog,
+    selected_file: Option<PathBuf>,
+}
+
+impl MyApp {
+    pub fn new(_cc: &eframe::CreationContext) -> Self {
+        Self {
+            file_dialog: FileDialog::new(),
+            selected_file: None,
+        }
+    }
+}
+
+impl eframe::App for MyApp {
+    fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
+        egui::CentralPanel::default().show(ctx, |ui| {
+            if ui.button("Select file").clicked() {
+                self.file_dialog.select_file();
+            }
+
+            ui.label(format!("Selected file: {:?}", self.selected_file));
+
+            if let Some(path) = self.file_dialog.update(ctx).selected() {
+                self.selected_file = Some(path.to_path_buf());
+            }
+        });
+    }
+}
+
+fn main() -> eframe::Result<()> {
+    eframe::run_native(
+        "File dialog example",
+        eframe::NativeOptions::default(),
+        Box::new(|ctx| Box::new(MyApp::new(ctx))),
+    )
+}