Add contribution section (#66)

* readme updates, fix out of date content

* fix

* fix broken link

runtime/manual/getting_started/first_steps.md

@@ -104,7 +104,7 @@ deno run --allow-net=deno.com https://deno.land/[email protected]/examples/curl.ts htt
 
 Deno also provides APIs that do not come from the web. These are all contained
 in the `Deno` global. You can find documentation for these built-in APIs here at
-[`/api`](/api).
+[`/api`](https://deno.land/api).
 
 Filesystem APIs for example do not have a web standard form, so Deno provides
 its own API.
@@ -195,5 +195,5 @@ You will see a JSON response from the Deno GitHub page.
 
 ## More examples
 
-You can find more examples in the [Examples](../examples) chapter and at
+You can find more examples in the [Tutorials](/runtime/tutorials) section and at
 [Deno by Example](https://examples.deno.land/).