Add a Google Cloud Natural Language API sample.

Author: SurferJeffAtGoogle

language/api/README.md

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+# Google Cloud Natural Language API Samples
+
+These samples show how to use the [Google Cloud Natural Language API][language-api]
+to analyze text.
+
+This repository contains samples that use the [Google Cloud
+Library for PHP][google-cloud-php] to make REST calls as well as
+contains samples using the more-efficient (though sometimes more
+complex) [GRPC][grpc] API. The GRPC API also allows streaming requests.
+
+[speech-api]: http://cloud.google.com/natural-language
+[google-cloud-php]: https://googlecloudplatform.github.io/google-cloud-php/
+[grpc]: http://grpc.io

language/api/composer.json

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+{
+    "require": {
+        "google/cloud": "0.8",
+        "symfony/console": "^3.0"
+    },
+    "autoload": {
+        "psr-4": {
+            "Google\\Cloud\\Samples\\Language\\": "src/"
+        },
+        "files": [
+            "src/functions/analyze_entities.php",
+            "src/functions/analyze_everything.php",
+            "src/functions/analyze_sentiment.php",
+            "src/functions/analyze_syntax.php"
+        ]
+    }
+}