Added basic example with includes

examples/.gitignore

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+target

examples/Cargo.toml

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+[workspace]
+members = [
+  "application",
+]

examples/application/Cargo.toml

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+[package]
+name = "application"
+version = "0.1.0"
+
+[dependencies]
+actix-web = "0.6"

examples/application/src/main.rs

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+extern crate actix_web;
+use actix_web::{App, Responder, HttpRequest, http::Method};
+
+// <setup>
+fn index(req: HttpRequest) -> impl Responder {
+    "Hello world!"
+}
+
+fn main() {
+    let app = App::new()
+        .prefix("/app")
+        .resource("/index.html", |r| r.method(Method::GET).f(index))
+        .finish();
+}
+// </setup>