add readmes for all packages (#1495)

* add bigquery readme

* add all readmes

* copy readme as part of release script

* gcloud-node -> google-cloud-node

* fix youre good to gos

* add resource manager scope

* exclude unecessary files

Author: stephenplusplus

README.md

@@ -0,0 +1,108 @@
+# @google-cloud/datastore
+> Google Cloud Datastore Client Library for Node.js
+
+*Looking for more Google APIs than just Datastore? You might want to check out [`google-cloud`][google-cloud].*
+
+- [API Documentation][gcloud-datastore-docs]
+- [Official Documentation][cloud-datastore-docs]
+
+*Follow the [activation instructions][cloud-datastore-activation] to use the Google Cloud Datastore API with your project.*
+
+```sh
+$ npm install --save @google-cloud/datastore
+```
+```js
+var datastore = require('@google-cloud/datastore')({
+  projectId: 'grape-spaceship-123',
+  keyFilename: '/path/to/keyfile.json'
+});
+
+var key = datastore.key(['Product', 'Computer']);
+
+datastore.get(key, function(err, entity) {
+  console.log(err || entity);
+});
+
+// Save data to Datastore.
+var blogPostData = {
+  title: 'How to make the perfect homemade pasta',
+  author: 'Andrew Chilton',
+  isDraft: true
+};
+
+var blogPostKey = datastore.key('BlogPost');
+
+datastore.save({
+  key: blogPostKey,
+  data: blogPostData
+}, function(err) {
+  // `blogPostKey` has been updated with an ID so you can do more operations
+  // with it, such as an update.
+  blogPostData.isDraft = false;
+
+  datastore.save({
+    key: blogPostKey,
+    data: blogPostData
+  }, function(err) {
+    if (!err) {
+      // The blog post is now published!
+    }
+  });
+});
+```
+
+
+## Authentication
+
+It's incredibly easy to get authenticated and start using Google's APIs. You can set your credentials on a global basis as well as on a per-API basis. See each individual API section below to see how you can auth on a per-API-basis. This is useful if you want to use different accounts for different Google Cloud services.
+
+### On Google Compute Engine
+
+If you are running this client on Google Compute Engine, we handle authentication for you with no configuration. You just need to make sure that when you [set up the GCE instance][gce-how-to], you add the correct scopes for the APIs you want to access.
+
+``` js
+// Authenticating on a global basis.
+var projectId = process.env.GCLOUD_PROJECT; // E.g. 'grape-spaceship-123'
+
+var datastore = require('@google-cloud/datastore')({
+  projectId: projectId
+});
+
+// ...you're good to go!
+```
+
+### Elsewhere
+
+If you are not running this client on Google Compute Engine, you need a Google Developers service account. To create a service account:
+
+1. Visit the [Google Developers Console][dev-console].
+2. Create a new project or click on an existing project.
+3. Navigate to  **APIs & auth** > **APIs section** and turn on the following APIs (you may need to enable billing in order to use these services):
+  * Google Cloud Datastore API
+4. Navigate to **APIs & auth** >  **Credentials** and then:
+  * If you want to use a new service account, click on **Create new Client ID** and select **Service account**. After the account is created, you will be prompted to download the JSON key file that the library uses to authenticate your requests.
+  * If you want to generate a new key for an existing service account, click on **Generate new JSON key** and download the JSON key file.
+
+``` js
+var projectId = process.env.GCLOUD_PROJECT; // E.g. 'grape-spaceship-123'
+
+var datastore = require('@google-cloud/datastore')({
+  projectId: projectId,
+
+  // The path to your key file:
+  keyFilename: '/path/to/keyfile.json'
+
+  // Or the contents of the key file:
+  credentials: require('./path/to/keyfile.json')
+});
+
+// ...you're good to go!
+```
+
+
+[google-cloud]: https://github.com/GoogleCloudPlatform/google-cloud-node
+[gce-how-to]: https://cloud.google.com/compute/docs/authentication#using
+[dev-console]: https://console.developers.google.com/project
+[gcloud-datastore-docs]: https://googlecloudplatform.github.io/google-cloud-node/#/docs/datastore
+[cloud-datastore-docs]: https://cloud.google.com/datastore/docs
+[cloud-datastore-activation]: https://cloud.google.com/datastore/docs/activate