DLP samples (GoogleCloudPlatform#322)

* First draft of DLP samples

* Fix DLP tests

* Add README

* Fix README bugs

Author: Ace Nassri

dlp/README.md

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+<img src="https://avatars2.githubusercontent.com/u/2810941?v=3&s=96" alt="Google Cloud Platform logo" title="Google Cloud Platform" align="right" height="96" width="96"/>
+
+# Data Loss Prevention API Node.js Samples
+
+The [Data Loss Prevention][dlp_docs] (DLP) API provides programmatic access to a powerful detection engine for personally identifiable information and other privacy-sensitive data in unstructured data streams.
+
+This code provides a demonstration of the DLP API's functionality via REST in Node.js. It is intended for developers who want to be early adopters of the API.
+
+[gRPC](https://grpc.io)-based samples/client libraries for [several languages](https://cloud.google.com/docs/) are under active development, and will be released shortly.
+
+## Table of Contents
+
+* [Setup](#setup)
+* [Samples](#samples)
+  * [Getting started with the Data Loss Prevention API](#getting-started-with-data-loss-prevention-api)
+
+## Setup
+
+1. Read [Prerequisites][prereq] and [How to run a sample][run] first.
+1. Install dependencies:
+
+        npm install
+
+[prereq]: ../README.md#prerequisities
+[run]: ../README.md#how-to-run-a-sample
+
+## Samples
+
+### Getting started with the Data Loss Prevention API
+
+View the [DLP documentation][dlp_docs] or the [samples][dlp_samples].
+
+__Run the samples:__
+
+```sh
+node inspect.js --help
+```
+
+```
+Commands:
+  Commands:
+  string <string>                  Inspect a string using the Data Loss Prevention API.
+  file <filepath>                  Inspects a local text, PNG, or JPEG file using the Data Loss Prevention API.
+  gcsFile <bucketName> <fileName>  Inspects a text file stored on Google Cloud Storage using the Data Loss Prevention
+                                   API.
+  datastore <kind>                 Inspect a Datastore instance using the Data Loss Prevention API.
+
+Options:
+  --help               Show help                                                                               [boolean]
+  -m, --minLikelihood
+          [string] [choices: "LIKELIHOOD_UNSPECIFIED", "VERY_UNLIKELY", "UNLIKELY", "POSSIBLE", "LIKELY", "VERY_LIKELY"]
+                                                                                     [default: "LIKELIHOOD_UNSPECIFIED"]
+  -f, --maxFindings                                                                                         [default: 0]
+  -q, --includeQuote                                                                           [boolean] [default: true]
+  -a, --authToken                                                                                     [string] [default:
+  "ab97.XXX..."]
+  -t, --infoTypes                                                                                  [array] [default: []]
+
+Examples:
+  node inspect.js string "My phone number is (123) 456-7890
+  and my email address is [email protected]"
+  node inspect.js file resources/test.txt
+  node inspect.js gcsFile my-bucket my-file.txt
+
+For more information, see https://cloud.google.com/dlp/docs. Optional flags are explained at
+https://cloud.google.com/dlp/docs/reference/rest/v2beta1/content/inspect#InspectConfig
+```
+
+```sh
+node metadata.js --help
+```
+
+```
+Commands:
+  infoTypes <category>  List types of sensitive information within a category.
+  categories            List root categories of sensitive information.
+
+Options:
+  --help           Show help                                                                                   [boolean]
+  -a, --authToken                                                                                     [string] [default:
+  "ab97.XXX..."]
+                                                                                                           oz0146E86Lk"]
+
+Examples:
+  node metadata.js infoTypes GOVERNMENT
+  node metadata.js categories
+
+For more information, see https://cloud.google.com/dlp/docs
+```
+
+```sh
+node redact.js --help
+```
+
+```
+Commands:
+  string <string> <replaceString>  Redact sensitive data from a string using the Data Loss Prevention API.
+
+Options:
+  --help               Show help                                                                               [boolean]
+  -t, --infoTypes                                                                                     [array] [required]
+  -m, --minLikelihood
+          [string] [choices: "LIKELIHOOD_UNSPECIFIED", "VERY_UNLIKELY", "UNLIKELY", "POSSIBLE", "LIKELY", "VERY_LIKELY"]
+                                                                                     [default: "LIKELIHOOD_UNSPECIFIED"]
+  -a, --authToken                                                                                     [string] [default:
+  "ab97.XXX..."]
+                                                                                                           htPfG_eIy04"]
+
+Examples:
+  node redact.js string "My name is Gary" "REDACTED" -t
+  US_MALE_NAME
+
+For more information, see https://cloud.google.com/dlp/docs. Optional flags are explained at
+https://cloud.google.com/dlp/docs/reference/rest/v2beta1/content/inspect#InspectConfig
+```
+
+For more information, see [the docs][dlp_docs].
+
+[dlp_samples]: ../dlp
+[dlp_docs]: https://cloud.google.com/dlp/docs/