Lint code.

Added a deno.json and set linting rules.  Obviously they are the
perfect rules and no one should argue with them in any fashion
ever.

src/server.ts

@@ -1,9 +1,9 @@
-import { Application } from "https://deno.land/x/oak/mod.ts";
+import { Application } from 'https://deno.land/x/oak/mod.ts';
 
 const app = new Application();
 
 app.use((ctx) => {
-  ctx.response.body = "Hello World!";
+    ctx.response.body = 'Hello World!';
 });
 
 await app.listen({ port: 9000 });