Example for API routes with middleware

[huv1k]

This PR adds a new example for API routes with custom middleware.

[github-actions]

Stats from current PR

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	zeit/next.js canary	huv1k/next.js api-routes-middleware	Change
Build Duration	13.8s	13.7s	-140ms
node_modules Size	45.4 MB	45.4 MB	⚠️ +177 B
Total Bundle (main, webpack, commons) Size	210 kB	210 kB	✓
Total Bundle (main, webpack, commons) gzip Size	68.8 kB	68.8 kB	✓
Client _app Size	2.39 kB	2.39 kB	✓
Client _app gzip Size	1.08 kB	1.08 kB	✓
Client _error Size	8.45 kB	8.45 kB	✓
Client _error gzip Size	3.24 kB	3.24 kB	✓
Client pages/index Size	296 B	296 B	✓
Client pages/index gzip Size	222 B	222 B	✓
Client pages/link Size	4.19 kB	4.19 kB	✓
Client pages/link gzip Size	1.82 kB	1.82 kB	✓
Client pages/routerDirect Size	423 B	423 B	✓
Client pages/routerDirect gzip Size	306 B	306 B	✓
Client pages/withRouter Size	435 B	435 B	✓
Client pages/withRouter gzip Size	301 B	301 B	✓
Client main Size	23.7 kB	23.7 kB	✓
Client main gzip Size	7.81 kB	7.81 kB	✓
Client commons Size	184 kB	184 kB	✓
Client commons gzip Size	59.7 kB	59.7 kB	✓
Client webpack Size	1.49 kB	1.49 kB	✓
Client webpack gzip Size	770 B	770 B	✓
Base Rendered Size	1.36 kB	1.36 kB	✓
Build Dir Size	757 kB	757 kB	✓

Click to expand serverless stats

	zeit/next.js canary	huv1k/next.js api-routes-middleware	Change
Build Duration	14.3s	14.4s	⚠️ +73ms
node_modules Size	45.4 MB	45.4 MB	⚠️ +177 B
Total Bundle (main, webpack, commons) Size	210 kB	210 kB	✓
Total Bundle (main, webpack, commons) gzip Size	68.8 kB	68.8 kB	⚠️ +1 B
Client _app Size	2.39 kB	2.39 kB	✓
Client _app gzip Size	1.08 kB	1.08 kB	-1 B
Client _error Size	8.45 kB	8.45 kB	✓
Client _error gzip Size	3.24 kB	3.24 kB	✓
Client pages/index Size	296 B	296 B	✓
Client pages/index gzip Size	222 B	224 B	⚠️ +2 B
Client pages/link Size	4.19 kB	4.19 kB	✓
Client pages/link gzip Size	1.82 kB	1.82 kB	✓
Client pages/routerDirect Size	423 B	423 B	✓
Client pages/routerDirect gzip Size	306 B	306 B	✓
Client pages/withRouter Size	435 B	435 B	✓
Client pages/withRouter gzip Size	301 B	300 B	-1 B
Client main Size	23.7 kB	23.7 kB	✓
Client main gzip Size	7.81 kB	7.81 kB	✓
Client commons Size	184 kB	184 kB	✓
Client commons gzip Size	59.7 kB	59.7 kB	✓
Client webpack Size	1.49 kB	1.49 kB	✓
Client webpack gzip Size	770 B	770 B	✓
Serverless pages/link Size	338 kB	338 kB	✓
Serverless pages/link gzip Size	86.8 kB	86.8 kB	-1 B
Serverless pages/index Size	Error getting size	Error getting size	✓
Serverless pages/index gzip Size	Error getting size	Error getting size	✓
Serverless pages/_error Size	328 kB	328 kB	✓
Serverless pages/_error gzip Size	84 kB	84 kB	-1 B
Serverless pages/routerDirect Size	329 kB	329 kB	✓
Serverless pages/routerDirect gzip Size	84.3 kB	84.3 kB	-2 B
Serverless pages/withRouter Size	329 kB	329 kB	✓
Serverless pages/withRouter gzip Size	84.3 kB	84.3 kB	✓
Build Dir Size	1.94 MB	1.94 MB	✓