add psgi example

examples/app.psgi

@@ -0,0 +1,32 @@
+#!/usr/bin/env perl
+
+use strict;
+use warnings;
+
+use Routes::Tiny;
+
+my $routes = build_routes();
+
+sub {
+    my $env = shift;
+
+    my $path   = $env->{PATH_INFO};
+    my $method = $env->{REQUEST_METHOD};
+
+    if (my $match = $routes->match($path, method => $method)) {
+        my $action = $match->params->{action};
+
+        return [200, [], ['Hello from ' . $action]];
+    }
+
+    return [200, [], ['Not Found']];
+};
+
+sub build_routes {
+
+    my $routes = Routes::Tiny->new;
+
+    $routes->add_route('/:action');
+
+    return $routes;
+}