Add auth support (#21)

* Updates

* Update

* Update

* Update

* Update

* Yarn sometimes prefers npmrc, so use same token

* Description

* Update readme

* Feedback

* Add type

* new toolkit and scoped registries

* npmrc in RUNNER_TEMP

* Dont always auth

* Try exporting blank token

* Get auth working for now pending runner changes

* Fix string interpolation for auth token.

* Don't export both userconfigs

* Update authutil.js

* Add single quotes for authString

* Fix the registry string.

* Use userconfig and append trailing slash

* Keep in root of repo

* Try just adding auth token

* Remove auth token

* Try changes again

* Add tests

* Npm and GPR samples

* Add types

node_modules/@actions/github/README.md

@@ -0,0 +1,48 @@
+# `@actions/github`
+
+> A hydrated Octokit client.
+
+## Usage
+
+Returns an [Octokit SDK] client. See https://octokit.github.io/rest.js for the API.
+
+```
+const github = require('@actions/github');
+const core = require('@actions/core');
+
+// This should be a token with access to your repository scoped in as a secret.
+const myToken = core.getInput('myToken');
+
+const octokit = new github.GitHub(myToken);
+
+const pulls = await octokit.pulls.get({
+    owner: 'octokit',
+    repo: 'rest.js',
+    pull_number: 123,
+    mediaType: {
+      format: 'diff'
+    }
+});
+
+console.log(pulls);
+```
+
+You can also make GraphQL requests:
+
+```
+const result = await octokit.graphql(query, variables);
+```
+
+Finally, you can get the context of the current action:
+
+```
+const github = require('@actions/github');
+
+const context = github.context;
+
+const newIssue = await octokit.issues.create({
+  ...context.repo,
+  title: 'New issue!',
+  body: 'Hello Universe!'
+});
+```