Add a placeholder GitHub package

This will serve as something to build testing/TypeScript tooling around

README.md

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+# `@actions/github`
+
+> TODO: description
+
+## Usage
+
+```
+const github = require('@actions/github');
+
+// TODO: DEMONSTRATE API
+```

__tests__/github.test.js

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+'use strict';
+
+// const github = require('..');
+
+describe('@actions/github', () => {
+  it('needs tests', () => {
+
+  });
+});

lib/github.js

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+'use strict';
+
+module.exports = github;
+
+function github() {
+    // TODO
+}

package.json

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+{
+  "name": "@actions/github",
+  "version": "0.0.0",
+  "description": "Actions tools for the GitHub API and GitHub context",
+  "keywords": [
+    "github",
+    "actions",
+    "toolkit"
+  ],
+  "homepage": "https://github.com/actions/toolkit/tree/master/packages/github",
+  "license": "MIT",
+  "directories": {
+    "lib": "lib",
+    "test": "__tests__"
+  },
+  "files": [
+    "lib"
+  ],
+  "publishConfig": {
+    "access": "public"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/actions/toolkit.git"
+  },
+  "scripts": {
+    "test": "echo \"Error: run tests from root\" && exit 1"
+  },
+  "bugs": {
+    "url": "https://github.com/actions/toolkit/issues"
+  }
+}